4(x 8) - 7(x - 1) 12 July 8, 2019 16 32 64 128 4 x 8 )- 7 x 1 12 2x x 4 )+ 7 =( x 8 )+ 2x x 1 )+ 12 1 3 4 x 11 7 8 x 12 lvl
