document.write( "Question 804278: How do I isolate \"X\" in the following equation? 105*(x/(x+70))+45*(x/(x+70))=100
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Algebra.Com's Answer #484680 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+105%2A%28x%2F%28x%2B70%29%29%2B45%2A%28x%2F%28x%2B70%29%29=100+\"$
\n" ); document.write( "You can multiply both sides by $\"+%28+x%2B70+%29%2Fx+\"$
\n" ); document.write( "with the provision that $\"+x+\"$ cannot = $\"+0+\"$
\n" ); document.write( "------------
\n" ); document.write( " $\"+105+%2B+45+=+%28%28+x%2B70+%29%2Fx%29%2A100+\"$
\n" ); document.write( " $\"+150+=+%28%28+x%2B70+%29%2Fx%29%2A100+\"$
\n" ); document.write( "Divide both sides by $\"+100+\"$
\n" ); document.write( " $\"+1.5+=+%28+x%2B70+%29%2Fx+\"$
\n" ); document.write( "Multiply both sides by $\"+x+\"$
\n" ); document.write( " $\"+1.5x+=+x+%2B+70+\"$
\n" ); document.write( " $\"+.5x+=+70+\"$
\n" ); document.write( " $\"+x+=+140+\"$
\n" ); document.write( "check answer:
\n" ); document.write( " $\"+105%2A%28x%2F%28x%2B70%29%29%2B45%2A%28x%2F%28x%2B70%29%29=100+\"$
\n" ); document.write( " $\"+105%2A%28140%2F%28140%2B70%29%29%2B45%2A%28140%2F%28140%2B70%29%29=100+\"$
\n" ); document.write( " $\"+105%2A%282%2F3%29+%2B+45%2A%282%2F3%29+=+100+\"$
\n" ); document.write( " $\"+35%2A2+%2B15%2A2+=+100+\"$
\n" ); document.write( " $\"+70+%2B+30+=+100+\"$
\n" ); document.write( " $\"+100+=+100+\"$
\n" ); document.write( "OK \n" ); document.write( "

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