12(10b - (3^3 - 2)) = 2(-31b + 2.5 * 122) 12(10b - (27 - 2)) = 2(-31b + 305) 12(10b - 25) = -62b + 610 120b - 300 = -62b + 610 182b = 910 b = 5 why did I spend 15 minutes on doing this simple equation