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12=3g-42
We move all terms to the left:
12-(3g-42)=0
We get rid of parentheses
-3g+42+12=0
We add all the numbers together, and all the variables
-3g+54=0
We move all terms containing g to the left, all other terms to the right
-3g=-54
g=-54/-3
g=+18
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