document.write( "Question 53011: I need help on how to solve Equations by multiplying the LCD!!!!!! \r
\n" ); document.write( "\n" ); document.write( "Here's one of my problems: 1/2 - x/30 = 3(x + 7)/90.
\n" ); document.write( "Here's how it shold read if it makes no sense to you, one half minus x over thrity equals three x plus seven divided by nintey.
\n" ); document.write( "I hope that will make it easier for you to solve it. \n" ); document.write( "

Algebra.Com's Answer #35361 by AnlytcPhil(1806) $\"\"$ $\"About$

You can put this solution on YOUR website!

1/2 - x/30 = 3(x + 7)/90.\r\n" );
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document.write( " 1      x     3(x + 7)\r\n" );
document.write( "--- - ---- = ----------\r\n" );
document.write( " 2     30        90\r\n" );
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document.write( "2, 30 and 90 will all divide evenly into 90. So 90\r\n" );
document.write( "is the LCD.\r\n" );
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document.write( "Put 90 over 1 like this with a times sign beside it.\r\n" );
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document.write( " 90\r\n" );
document.write( "----·\r\n" );
document.write( "  1\r\n" );
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document.write( "Now stick it before every one of those fraction terms:\r\n" );
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document.write( " 90   1     90    x     90   3(x + 7)\r\n" );
document.write( "----·--- - ----·---- = ----·----------\r\n" );
document.write( "  1   2      1   30      1      90\r\n" );
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document.write( "Now you can cancel the 2 into the 90 on the left, \r\n" );
document.write( "getting 45. You can cancel the 30 into the 90, \r\n" );
document.write( "getting 3.  You can cancel the 90's on the right.\r\n" );
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document.write( " 45         3           1    \r\n" );
document.write( " 90   1     90    x     90   3(x + 7)\r\n" );
document.write( "----·--- - ----·---- = ----·----------\r\n" );
document.write( "  1   2      1   30      1      90\r\n" );
document.write( "      1          1              1\r\n" );
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document.write( "Now all the denominators are just 1 and therefore can be\r\n" );
document.write( "left understood, so we just have this::\r\n" );
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document.write( "             45 - 3x = 3(x + 7)\r\n" );
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document.write( "Now you can finish that, right?\r\n" );
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document.write( "Answer:            x = 4\r\n" );
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document.write( "Edwin

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