Решите уравнение: 3(х+6)=х+2(х+9).

\[3 \cdot (x + 6) = x + 2 \cdot (x + 9)\]

\[3x + 18 = x + 2x + 18\]

\[3x - x - 2x = 18 - 18\]

\[0x = 0\]

\[x - любое\ число.\]