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5a+30=6a+13
We move all terms to the left:
5a+30-(6a+13)=0
We get rid of parentheses
5a-6a-13+30=0
We add all the numbers together, and all the variables
-1a+17=0
We move all terms containing a to the left, all other terms to the right
-a=-17
a=-17/-1
a=+17
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