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