12 2x 8 July 8, 2019 16 32 64 128 12 2x =- 8 x 12 2x 8 )= 4x 12 2x 8 x 4 12 2x 8 7x 5 5x 12 2x 8 15 12 2x 8 14 12 2x 8 ≤ 20 12 2x 8 7 x 12 2x 8 x 16 12 8x 2x 2 2x 12 8y 2x 12 8x 2x 12 8x 6 2x 12 8x 5 2x 12 8x 18