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-3=12+3g
We move all terms to the left:
-3-(12+3g)=0
We add all the numbers together, and all the variables
-(3g+12)-3=0
We get rid of parentheses
-3g-12-3=0
We add all the numbers together, and all the variables
-3g-15=0
We move all terms containing g to the left, all other terms to the right
-3g=15
g=15/-3
g=-5
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