3 12x 2 6x 15 July 8, 2019 16 32 64 128 4x 4 12x 3 5x 2 6x 15 0 3x 4 12x 3 6x 2 15x 12x 3 2i 5y 2 6x 9u )+ 15y 2 1 3 12x 9 )= 6x 15 6-3x 12
