I know 6% of $3000 is $180
But I don't understand the rest of the question.
12c - 53 = 91
First add 53 to each side. This cancels it out on the left (-53 + 53 = 0)
12c = 91 + 53
12c = 144
Now divide by 12 on each side. This cancels the 12 on the left (12/12 = 1)
c = 144/12
c = 12
-3.3=
Multiply both sides of the equation by 6 to isolate x.
-19.8=x
Your answer is -19.8.
I hope this helps :)