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8=3a+12
We move all terms to the left:
8-(3a+12)=0
We get rid of parentheses
-3a-12+8=0
We add all the numbers together, and all the variables
-3a-4=0
We move all terms containing a to the left, all other terms to the right
-3a=4
a=4/-3
a=-1+1/3
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