Given the function f(x) = 3x - 21 +6, for what values of x is f(x) = 18?

Answer:
C
Step-by-step explanation:
3|x-2|=18-6
3|x-2|=12
|x-2|=4
Ther are two options.
First;
x-2=-4
x=-2
Second;
x-2=4
x=6
If you don't understand, you can ask :)