1. (d-7)(d+1)-(d+6)(d-14) = d²-6d-7-d²+8d+84 = 2d+77
d=-0,14 => 77-0,28 = 76,72
2. 2x-ay+bz
2*(5c³+2)-3c*(6c²-c+13)+11c³*(5c-1) = 10c³+4-18c³+3c²-39c+55c⁴-11c³ = 55c⁴-19c³+3c²-39c+4
как то так ............................
