Question

`2(x-1)-5(x+2)=10`

Answer 1

\(2 ( x − 1 ) − 5 ( x + 2 ) = 10\)

\(⇔ 2 x − 2 − 5 x − 10 = 10\)

\(⇔ 2 x − 5 x = 10 + 10 + 2\)

\(⇔ − 3 x = 22\)

`<=>x=-22/3`

Answer 2

`2(x-1)-5(x+2)=10`

`=>2x-2-5x-10=10`

`=>-3x-12=10`

`=>-3x=10+12`

`=>-3x=22`

`=>x=22:(-3)~`

`=>x=-22/3`

Vậy `x=-22/3`

Answer 3

\(2\left(x-1\right)-5\left(x+2\right)=10\)

\(\Leftrightarrow2x-2-5x-10=10\)

\(\Leftrightarrow-3x-12-10=0\)

\(\Leftrightarrow-3x-22=0\)

\(\Leftrightarrow x=\dfrac{22}{3}\)

Vậy \(S=\left\{\dfrac{22}{3}\right\}\)