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-12=a/3-13
We move all terms to the left:
-12-(a/3-13)=0
We get rid of parentheses
-a/3+13-12=0
We multiply all the terms by the denominator
-a+13*3-12*3=0
We add all the numbers together, and all the variables
-1a+3=0
We move all terms containing a to the left, all other terms to the right
-a=-3
a=-3/-1
a=+3
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