3c 6 3 4 )- 9d 7 2 July 8, 2019 16 32 64 128 2 9c - 4 7 * (d + 4) 3 - 3 4c + 3 1d 3) - 7c(- 3d) 4) - 8c(- 3/4 * d) 2 9c-4 7d+4 3-3 4c+3 1d=
