7 8x 4 1 6 July 8, 2019 16 32 64 128 7 8x 1 4 5 6 7 8x 4 )- 3 1 4x 6 7 2 3 8x )= 4 6 1 5x 7 8x-4 6 7 8x-4 6x=11 2 7 8x-4 6x