Question

Is the expression -12x-18 equivalent to the expression -6x-9-3(3-2x)

Answer 1

-12x-18 and -6x-9-3(3-2x)

First, distribute the -3 into the parentheses. The second expression will turn out as such:
-6x-9-9-6x.
From here, you need to combine like terms (variables and numbers). -12x-18.
So, yes, these two expressions are equal.

Answer 2

-12x-18=-6x-9-3(3-2x)
-12x-18=-6x-9-9+6x
-12x-18=-6x+6x-9-9
-12x-18=-18
-12x-18=-18
+18=+18
-12x=0
X=0