A)-c-(-a+b)=-c+a-b
б)x-(a-b)+(c-d)=x-a+b+c-d
в)5x+(11-7x)=5x+11-7x=5x-7x+11=-2x+11
г)-(8c-4)+4=-8c+4+4=-8c+8
д)(5-3b)+(3b-11)=5-3b+3b-11=5-11-3b+3b=-6
е)(5a-3b)-(2+5a-3b)=5a-3b-2-5a+3b=5a-5a-3b+3b-2=-2
ё)16+3(2-3y)+8y=16+3*2-3*3y+8y=16+6-9y+8y=22-1y
ж)3-17a-11(2a-3)=3-17a-11*2a+11*3=3-17a-22a+33=3+33-17a-22a=36-39a