document.write( "Question 55897: I apologize but I do not have much information on the problem - it is for a 9th grade student and I have been out of school for a really long time and do not remember how to do algebra. The problem is:\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "4/5x-7=21+9/10x
\n" ); document.write( "

Algebra.Com's Answer #37903 by funmath(2933)\"\" \"About 
You can put this solution on YOUR website!
If x is in the denominator of the fraction, this is how you do it:
\n" ); document.write( "\"4%2F5x-7=21%2B9%2F10x\" The LCD (lowest common denominator) is 10x, multiply both sides of the = sign by 10x.
\n" ); document.write( "\"10x%284%2F5x-7%29=10x%2821%2B9%2F10x%29\"
\n" ); document.write( "\"40x%2F5x-70x=210x%2B90x%2F10x\"
\n" ); document.write( "\"8-70x=210x%2B9\"
\n" ); document.write( "\"8-70x%2B70x=70x%2B210x%2B9\"
\n" ); document.write( "\"8=280x%2B9\"
\n" ); document.write( "\"8-9=280x%2B9-9\"
\n" ); document.write( "\"-1=280x\"
\n" ); document.write( "\"-1%2F280=280x%2F280\"
\n" ); document.write( "\"-1%2F280=x\"
\n" ); document.write( "If this is what you meant, this is how you do it:
\n" ); document.write( "\"%284%2F5%29x-7=21%2B%289%2F10%29x\" The LCD is 10 and the fractions can be eliminated by multiplying both sides of the = sign by 10.
\n" ); document.write( "\"10%28%284%2F5%29x-7%29=10%2821%2B%289%2F10%29x%29\"
\n" ); document.write( "\"%2840%2F5%29x-70=210%2B%2890%2F10%29x\"
\n" ); document.write( "\"8x-70=210%2B9x\"
\n" ); document.write( "\"-8x%2B8x-70=210%2B9x-8x\"
\n" ); document.write( "\"-70=210%2Bx\"
\n" ); document.write( "\"-210-70=-210%2B210%2Bx\"
\n" ); document.write( "\"-280=x\"
\n" ); document.write( "Happy Calculating!!!
\n" ); document.write( "
\n" );