document.write( "Question 636177: [(3a+4)+(5a-4)]-[(2a-6)-(7a+9)] \n" ); document.write( "
Algebra.Com's Answer #400821 by stanbon(75887)\"\" \"About 
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[(3a+4)+(5a-4)]-[(2a-6)-(7a+9)]
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\n" ); document.write( "= [8a] - [-5a-15]
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\n" ); document.write( "= 8a+5a+15
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\n" ); document.write( "= 13a + 15
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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