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a-39=2a-88
We move all terms to the left:
a-39-(2a-88)=0
We get rid of parentheses
a-2a+88-39=0
We add all the numbers together, and all the variables
-1a+49=0
We move all terms containing a to the left, all other terms to the right
-a=-49
a=-49/-1
a=+49
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