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12=3g-9
We move all terms to the left:
12-(3g-9)=0
We get rid of parentheses
-3g+9+12=0
We add all the numbers together, and all the variables
-3g+21=0
We move all terms containing g to the left, all other terms to the right
-3g=-21
g=-21/-3
g=+7
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