3 2x 4 5x 12 x July 8, 2019 16 32 64 128 X 1 3 2x 1 4 5x 4 12 3 x 4 x + 5 - 21 + 12 x 12 + 4(x - 3) - 2x = (5 - 3x) + 9 3(4x + 5) - (21 + 12x)