a: \(\Leftrightarrow x^2+\left(x-1\right)\left(x-2\right)=2x\left(x-2\right)\)
\(\Leftrightarrow2x^2-3x+2-2x^2+4x=0\)
=>x=-2(nhận)
b: \(\Leftrightarrow x\left(x+1\right)+x\left(x-3\right)-4x=0\)
\(\Leftrightarrow x^2+x+x^2-3x-4x=0\)
\(\Leftrightarrow2x^2-6x=0\)
hay \(x\in\varnothing\)
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