1) 5-(а+3)
8-(10+b)
9-(c+7)
2) 2+(-8+c)
3+(-d-5)
4+(a-9)

1) 5-(а+3)=5-а-3=2-а8-(10+b)=8-10-b=-2-b9-(c+7)=9-c-7=2-c2) 2+(-8+c)=2-8+c=c-63+(-d-5)=3-d-5=-2-d4+(a-9)=4+a-9=a-5