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a-23=2a-77
We move all terms to the left:
a-23-(2a-77)=0
We get rid of parentheses
a-2a+77-23=0
We add all the numbers together, and all the variables
-1a+54=0
We move all terms containing a to the left, all other terms to the right
-a=-54
a=-54/-1
a=+54
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