\(\dfrac{2x+1}{3x+2}=\dfrac{x-1}{x-2}\) (đk: x≠ 2; \(-\dfrac{2}{3}\) )
⇔ \(\left(x-2\right)\left(2x+1\right)=\left(x-1\right)\left(3x+2\right)\)
⇔ \(2x^2+x-4x-2=3x^2+2x-3x-2\)
⇔ \(3x^2-x-2-2x^2+3x+2=0\)
⇔ \(x^2+2x=0\)
⇔ \(x\left(x+2\right)=0\)
⇒ \(\left[{}\begin{matrix}x=0\left(TM\right)\\x=-2\left(TM\right)\end{matrix}\right.\)
Vậy \(S=\left\{0;-2\right\}\)
\(\Leftrightarrow3x^2-3x+2x-2=2x^2-4x+x-2\)
\(\Leftrightarrow x^2+2x=0\)
=>x(x+2)=0
=>x=0 hoặc x=-2