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12=3a-6
We move all terms to the left:
12-(3a-6)=0
We get rid of parentheses
-3a+6+12=0
We add all the numbers together, and all the variables
-3a+18=0
We move all terms containing a to the left, all other terms to the right
-3a=-18
a=-18/-3
a=+6
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