3(5b+6) = 30 + 3b
1. Use the distributive property and multiply what's outside the parenthesis by whats on the inside.
15b + 18 = 30 + 3b
2. Next get rid of the 18 by subtracting it from itself and 30.
15b = 12 + 3b
3. After that you need to get rid of the 3b, so you would subtract 3b from itself and 15b.
12b = 12.
4.Next divide both sides by 12.
b= 1
Go back and insert your answer.