1) -23(5a-2d+1)-7 = -115а+46d-23-7=-115а+46d-30
2) -7(x-5y+3z-9)-9(z-2x+9y+8)-100x+100y-200 = -7х+35у-21z+63-9z+18х-81у-72-100х+100у-200=-89х+54у-30z-209
3) 2(a-7b)+5(11b-12a)-8(7a-5b)=2a-17b+55b-60a-56a+40b=-114a+78b
4) 15y+17a-19b-19(a+b-x-y)+12(2x+3y+7b)=15y+17a-19b-19a-19b+19x+19y+24x+36y+84b=70y-2a+46b+43x
5) 2(3x+7t-11)-2(7x-3t+12)=6x+14t-22-14x+6t-24=-8x+20t-46
6) 24x-56+37y-(x-y-9)-2(x+y-7)=24x-56+37y-x+y+9-2x-2y+14=21x+36y-33