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12+18a=12-2a
We move all terms to the left:
12+18a-(12-2a)=0
We add all the numbers together, and all the variables
18a-(-2a+12)+12=0
We get rid of parentheses
18a+2a-12+12=0
We add all the numbers together, and all the variables
20a=0
a=0/20
a=0
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