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49=5a-77
We move all terms to the left:
49-(5a-77)=0
We get rid of parentheses
-5a+77+49=0
We add all the numbers together, and all the variables
-5a+126=0
We move all terms containing a to the left, all other terms to the right
-5a=-126
a=-126/-5
a=25+1/5
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