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-(2a-3b+5)+(4a-7b+3)-(-3a-2b-1)
(4a+2b-7)-(a-3b-4)-(2a-b-3)
-(-2a+5b-4)+(2a-3b-45)-(-3a-b+2)
(-5a+b-3)-(2a-3b+5)-(4a-b-8)
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-(2a-3b+5)+(4a-7b+3)-(-3a-2b-1)=
-2a+3b-5+4a-7b+3+3a+2b+1=5a-2b-1
(4a+2b-7)-(a-3b-4)-(2a-b-3)=
4a+2b-7-a+3b+4-2a+b+3=a+6b
-(-2a+5b-4)+(2a-3b-45)-(-3a-b+2)=
2a-5b+4+2a-3b-45+3a+b-2=7a-7b-43
(-5a+b-3)-(2a-3b+5)-(4a-b-8)=
-5a+b-3-2a+3b-5-4a+b+8=-11a+5b
-(2a-3b+5)+(4a-7b+3)-(-3a-2b-1)=-2a+3b-5+4a-7b+3+3a+2b+1=
-2a+4a+3a+3b-7b+2b-10+3+1=5a-2b-1
(4a+2b-7)-(a-3b-4)-(2a-b-3)=4a+2b-7-a+3b+4-2a+b+3=a+6b
-(-2a+5b-4)+(2a-3b-45)-(-3a-b+2)=2a-5b+4+2a-3b-45+3a+b-2=7a-7b-43
(-5a+b-3)-(2a-3b+5)-(4a-b-8)=-5a+b-3-2a+3b-5-4a+b+8=-11a+5b