document.write( "Question 408339: 4x(x-5)-5x(x-4)=-1 \n" ); document.write( "
Algebra.Com's Answer #287717 by clarkp(14)\"\" \"About 
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4x²- 20x-5x²+ 20 =-1 BY associative property
\n" ); document.write( "-x²+0= -1 combine like terms
\n" ); document.write( "-x²=-1 by identity property of addition
\n" ); document.write( "x²=1 by inverse property of multiplication
\n" ); document.write( "therefore x= -1 or x= 1
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