3 7x 90 July 8, 2019 16 32 64 128 3 7x 90 135 5 (- 7x 3 )=- 90 7x 3 37 90 12x 3 7x 2 90 7x 3 16x 5 90 7x 3 2x 6 90 180 4x 3 7x 1 90 7x 3 2x 6 90 3 x 3 = 9 3 7x=9 3 x 7/9
