7 3 x 63 July 8, 2019 16 32 64 128 1 3 7 15 x 63 y 7x3 63x 7 x 3 3 7 15 x 63 3 7 x 63 1 3 7 x 630 3 7 15 x 63 127 7 x (- 3 63 (- 7 5 3 7 x 12 63 3 x 7 y 63 z 63 7 x 3 4 3 over 7 x 63 63 3 x 7 8 37 9 x (- 3 63 7 3 7 of 497 249 of x 639
