document.write( "Question 153120: How do you add a rational expression like this: 3x/10 + 9x/10? \n" ); document.write( "
Algebra.Com's Answer #112600 by checkley77(12844)\"\" \"About 
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3x/10 + 9x/10
\n" ); document.write( "Because the denominators are the same you can just add the numerators. Thus:
\n" ); document.write( "(3x+9x)/10=12x/10=6x/5 answer.
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