document.write( "Question 643867: Simplify the expression -9x + 15x ? \n" ); document.write( "
Algebra.Com's Answer #404678 by MathLover1(20849)\"\" \"About 
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\"-9x+%2B+15x+\"\r
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\n" ); document.write( "\n" ); document.write( "\"15x-9x+=%2815-9%29x=6x\"
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