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12=6g+3-3g
We move all terms to the left:
12-(6g+3-3g)=0
We add all the numbers together, and all the variables
-(3g+3)+12=0
We get rid of parentheses
-3g-3+12=0
We add all the numbers together, and all the variables
-3g+9=0
We move all terms containing g to the left, all other terms to the right
-3g=-9
g=-9/-3
g=+3
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