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13a+2=4a+38
We move all terms to the left:
13a+2-(4a+38)=0
We get rid of parentheses
13a-4a-38+2=0
We add all the numbers together, and all the variables
9a-36=0
We move all terms containing a to the left, all other terms to the right
9a=36
a=36/9
a=4
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