Question

Làm câu d

Answer 1

\(c,2\left(x-1\right)-3\left(x+5\right)=7\\ \Rightarrow2x-2-3x-15=7\\ \Rightarrow-x-17=7\\ \Rightarrow-x=24\\ \Rightarrow x=-24\\ d,4\left(1-x\right)+2\left(x+5\right)=7\\ \Rightarrow4-4x+2x+10=7\\ \Rightarrow-2x+14=7\\ \Rightarrow-2x=-7\\ \Rightarrow x=\dfrac{7}{2}\)

Answer 2

\(4\left(1-x\right)+2\left(x+5\right)=7\)

\(\Leftrightarrow4-4x+2x+10=7\)

\(\Leftrightarrow-2x+14=7\)

\(\Leftrightarrow-2x=-7\)

\(\Leftrightarrow x=\dfrac{7}{2}\)