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12a-60=-13a
We move all terms to the left:
12a-60-(-13a)=0
We get rid of parentheses
12a+13a-60=0
We add all the numbers together, and all the variables
25a-60=0
We move all terms containing a to the left, all other terms to the right
25a=60
a=60/25
a=2+2/5
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