Lời giải em nhé!
\(2(-1+x)+5(-x+2)=-14+x\\ \Rightarrow -2+2x-5x+10=-14+x\\ \Rightarrow -3x+8=-14+x\\ \Rightarrow -3x-x=-14-8\\ \Rightarrow -4x=-22\\ \Rightarrow x=\dfrac{11}{2}\)
\(2\left(-1+x\right)+5\left(-x+2\right)=-14+x=>-2+2x-5x+10+14-x=0< =>22-4x=0< =>-4x=-22< =>x=5,5\)