Answer:
[tex](6x + 12) = - 24 \\ 6x = - 24 - 12 \\ 6x = - 36 \\ \\ x = \frac{ - 36}{6} \\ \\ x = - 6[/tex]
I hope I helped you^_^
6x+12=-24
or,6x=-24-12
or,6x=-36
or,x=-36/6
;x=-6