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3(a+5)=2a-39
We move all terms to the left:
3(a+5)-(2a-39)=0
We multiply parentheses
3a-(2a-39)+15=0
We get rid of parentheses
3a-2a+39+15=0
We add all the numbers together, and all the variables
a+54=0
We move all terms containing a to the left, all other terms to the right
a=-54
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