2(A+B) - (A-B) = 2A + 2B - A + B = A + 3B
3(2X + 4B) + 5(7 - 6B) = 6X + 12B + 35 - 30B = 6X - 18B + 35
2(A+B) - (A-B) = 2A + 2B - A + B = A + 3B
3(2X + 4B) + 5(7 - 6B) = 6X + 12B + 35 - 30B = 6X - 18B + 35