Question

-2.x+3.(x-2)+9=12+4x

Answer 1

\(-2x+3\left(x-2\right)+9=12+4x\)

\(\Rightarrow-2x+3x-6+9-4x=12\)

\(\Rightarrow-3x=12+6-9\)

\(\Rightarrow-3x=9\Rightarrow x=-3\)

Vậy..............

Answer 2

\(-2.x+3.(x-2)+9=12+4x\)

\(\Leftrightarrow-2.x+3.x+3.\left(-2\right)+9=12+4x\)

\(\Leftrightarrow-2x+3x-6+9=12+4x\)

\(\Leftrightarrow-2x+3x-4x=12+6-9\)

\(\Leftrightarrow-3x=9\)

\(\Leftrightarrow x=\dfrac{9}{-3}\)

\(\Leftrightarrow x=-3\)

Vậy \(x=-3\)