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.
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Algebra.Com's Answer #35362 by funmath(2933)\"\" \"About 
You can put this solution on YOUR website!
This one's easier to solve if you simplify a little before you multipy by the LCD.
\n" ); document.write( "\"1%2F2-x%2F30=3%28x%2B7%29%2F90\"
\n" ); document.write( "\"1%2F2-x%2F30=%28x%2B7%29%2F30\"
\n" ); document.write( "The LCD is 30, multiply both sides of the equation by the LCD and the denominators all cancel:
\n" ); document.write( "\"30%281%2F2-x%2F30%29=30%28%28x%2B7%29%2F30%29\"
\n" ); document.write( "\"30%2F2-30x%2F30=30%28x%2B7%29%2F30\"
\n" ); document.write( "\"15-x=%28x%2B7%29\"
\n" ); document.write( "\"15-x=x%2B7\"
\n" ); document.write( "\"15-x-x=-x%2Bx%2B7\"
\n" ); document.write( "\"15-2x=7\"
\n" ); document.write( "\"-15%2B15-2x=-15%2B7\"
\n" ); document.write( "\"-2x=-8\"
\n" ); document.write( "\"%28-2x%29%2F%28-2%29=%28-8%29%2F%28-2%29\"
\n" ); document.write( "\"x=4\"
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