x-x+4/x-1=x/x-1. find x
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=>x - (x+ 4)/(x - 1) = x/(x - 1)
=>(x ^2 - x - x - 4)/(x - 1)= x/(x - 1)
=>x^2 -2x - 4 = x
=>x^2 - 3x - 4= 0
=>x^2 - 4x + x - 4= 0
=>x( x - 4) + 1(x - 4)= 0
=>(x + 1)(x - 4)= 0
=>x = -1 and 4
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