Answer:

Step-by-step explanation:
First, distribute the -2 to the rest of the parenthesis, following PEMDAS.

Then, add -6a to both sides.

Now, you can divide both sides by 2 to isolate b.

Divide to simplify.

A. The answer is 6$ because 3 x 2 is 6
B. The answer is 12
9 x 5 = 45 and 9 x 50 = 450
0+a+b
a=2
b=10
0+2+10=12/3=4
4=2a
5a is the answer.