solve for the unknown value in the give equation

(1). 3 (12 - b) = 2 (b - 6)
(2). 13p - 26 - p - 6 = 0?

I'll do the first one for you.

3 (12 - b) = 2 (b - 6)
36 - 3b = 2b - 12
Add 12 to each side.
48 - 3b = 2b
Add 3b to each side
48 = 5b
Divide both sides by 5
48/5 = 9.6 = b

I'll check your work for the second problem.