53
-(2+3a)-(7a-2)=-2-3a-7a+2=-10a
54
-(5-2b)-(7+10b)=-5+2b-7-10b=-8b-12
55
-(2-3a)+(7a-2)=-2+3a+7a-2=10a-4
56
-(2b-5)-(7+10b)=-2b+5-7-10b=-12b-2
57
-(2-3a)-(7a-2)=-2+3a-7a+2=-4a
58
-(2b-5)+(7+10b)=-2b+5+7+10b=8b+12
59
-(2-3a)-(2-7a)=-2+3a-2+7a=10a-4
60
(2b-5)-(7-10b)=2b-5-7+10b=12b-12
61
-5-(1-9y)-(22y-4)=-5-1+9y-22y+4=-13y-2
62
x-(x-15)+(13+x)=x-x+15+13+x=x+28
63
5b-(6a+a)-(a-6b)=5b-6a-a-a+6b=11b-8a
64
14b-(15b+y)-(y+10b)=14b-15b-y-y-10b=-11b-2y
65
(6x-8)-5x-(4-9x)=6x-8-5x-4+9x=10x-12
66
(3a-21)-2a-(17-8a)=3a-21-2a-17+8a=9a-38
67
2x-3+(3x-2)=2x-3+3x-2=5x-5
68
x+5+(4x-6)=x+5+4x-6=5x-1
69
(4-x)-(5-2x)+(4x-8)=4-x-5+2x+4x-8=5x-9
70
(3x-2)-(5x-8)+(7-6x)=3x-2-5x+8+7-6x=-8x+13