\(x^2-x=x-2\)
\(x^2-x-x+2=0\)
\(x^2-2x+2=0\)
\(x^2-\left(2x-2\right)=0\)
\(x^2-2\left(x-1\right)=0\)
\(x^2-1-2\left(x-1\right)+1=0\)
\(\left(x-1\right)\left(x+1\right)-2\left(x-1\right)+1=0\)
\(\left(x-1\right)\left(x+1-2\right)+1=0\)
\(\left(x-1\right)\left(x-1\right)=-1\)
\(\left(x-1\right)^2=-1\)(vô lí)
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