3a+5-(2a+7)+(8-5a)
=3a+5-2a-7+8-5a
= -4a+6
-b+4+(3b-2)-(8b-5)
= -b+4+3b-2-8b+5
= -6b+7
6-5c-3c-(4-6c)+5+(7-2c)
=6-5c-3c-4+6c+5+7-2c
= -4c+18
d-1-(3d+4)-(5-4d)-(7d+5)+5
=d-1-3d-4-5+4d-7d-5+5
= -5d-10
