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2a=5a-39
We move all terms to the left:
2a-(5a-39)=0
We get rid of parentheses
2a-5a+39=0
We add all the numbers together, and all the variables
-3a+39=0
We move all terms containing a to the left, all other terms to the right
-3a=-39
a=-39/-3
a=+13
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