Answer:
Here you to first open the bracket by multiple with the sign and number next to it. after that u have to take b to one side and number to other side.
when you will take it, the minus will become + and vice versa
Explanation:
-b- 13- 4b = -15 + 27b+ 2
3b-13 = 27b-13
-13+13 = 27b-3b
0=24b
b = 0