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6g-12=3g+9
We move all terms to the left:
6g-12-(3g+9)=0
We get rid of parentheses
6g-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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