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-(a+45)=56
We move all terms to the left:
-(a+45)-(56)=0
We get rid of parentheses
-a-45-56=0
We add all the numbers together, and all the variables
-1a-101=0
We move all terms containing a to the left, all other terms to the right
-a=101
a=101/-1
a=-101
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