A) - 15x + 12 + 3?
A) - 15x + 12 + 3. (2x - 6) = 3x - (21x - 1) + 2 b) 4 - 2. (3 - x) + 5x - 7 = 12x - 19 c) (9x + 6) : 3 + 2 = 13 d) (8x - 6) : 2 = 3x - ((6 - 2x) + 7 e) (12x + 8) : 4 = (9x - 6) : 3 + 4 f) - 3x + 2 - 5(7 - 8x) = 4x - 3x - (2x + 3) + 27x.