Question

Giúp mình với: 2x+12=3(x-7)

Answer 1

\(2x+12=3\left(x-7\right)\)

\(\Leftrightarrow2x+12=3x-21\)

\(\Leftrightarrow-x+12=-21\)

\(\Leftrightarrow-x=-33\)

\(\Leftrightarrow x=33\)

Vậy \(x=33\)

Answer 2

\(2x+12=3(x-7)\)

\(2x+12=3x-21\)

\(2x=3x-21-12\)

\(2x=3x-33\)
\(3x-2x=33\)

\(x=33\)