1 3 3x 6 )- 2 7 7x 21 July 8, 2019 16 32 64 128 1 3 3x 6 )- 2 7 7x 21 )= 9 7. 1 3 (6x 1 - 3(1 2 - 2x) = 7 6x - 6 6
