178.

(-10)*(2+x+y) = -20-10x-10y

179.

(-15)*(c-d-3) = -15c+15d+45 = 45-15c-15d

180.

-19*(2-x)+20 = -38+19x+20 = 19x-18

181.

-18+8*(4-x) = -18+32-8x = 14-8x = 7-4x

182.

3b-(18+b)+8 = 3b-18-b+8 = 2b-10 = b-5

183.

-(13+b)+(-b-13) = -13-b-b-13 = -26-2b = 13+b

184.

-9*(y-4)-(12+y) = -9y+36-12-y = -10y+24 = 12-5y

185-187 на фото