13 7x 3 5 July 8, 2019 16 32 64 128 7x 3 4 9 13 5 6 7x 13 3 1x 86 5 7x 13 )- 3 x 5 7x 13 2 5x 3 ) 7 13 5 x 7 5 x 7 = 35 13 - (5x + (3x - (x - 7)))
