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18a-36=6a-12
We move all terms to the left:
18a-36-(6a-12)=0
We get rid of parentheses
18a-6a+12-36=0
We add all the numbers together, and all the variables
12a-24=0
We move all terms containing a to the left, all other terms to the right
12a=24
a=24/12
a=2
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