document.write( "Question 51827: y-x=-1
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Algebra.Com's Answer #34558 by checkley71(8403)\"\" \"About 
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y-x=-1 or y=x-1 then\r
\n" ); document.write( "\n" ); document.write( "2x-(x-1)=0 or 2x-x+1=0 or x+1=0 or x=-1\r
\n" ); document.write( "\n" ); document.write( "then y=-1-1 or y=-2\r
\n" ); document.write( "\n" ); document.write( "proof -2-(-1)=-1 or -2+1=-1 or -1=-1 & 2(-1)-(-2)=0 or -2+2=0 or 0=0
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