(2a-3b)+ (7a-8b ) =
(4x-12y)+(8x6y+5) =
- (3a+1)-(-2a+1)- (4a +4 ) =
(5x-4xy+5y)-(2x-xy-3y ) + (-x+2xy+y) =
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(2a-3b)+(7a-8b)= 2a-3b+7a-8b= 9a-11b
(4x-12y)+(8x6y+5)=4x-12y+48xy+5
-(3a+1)-(-2a+1)-(4a+4)=-3a-1+2a-1-4a-4=-5a-6
(5x-4xy+5y)-(2x-xy-3y)+ (-x+2xy+y) =5x-4xy+5y-2x+xy+3y-x+2xy+y=2x-xy+9y