Verified answer

[tex]4(x - 3) = x + 6 \\ 4x - 12 = x + 6 \\ 4x - x = 6 + 12 \\ 3x = 18 \\ x = 18 \div 3 \\ x = 6[/tex]

Ответ:

4x-12=x+6

4x-x=6+12

3x=18

x=18:3

x=6