solve and check the following equation: 15=-3(x-1)+9
x=-1
15=-3(x-1)+9
15-9=-3(x-1)
6=-3x+3
6-3=-3x
3=-3x
3/-3=-3x/-3
-1=x
15=-3(-1-1)+9
15=3+3+9
15=6+9
15=15
so the answer is x=-1
+193 
