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9g=12+15g
We move all terms to the left:
9g-(12+15g)=0
We add all the numbers together, and all the variables
9g-(15g+12)=0
We get rid of parentheses
9g-15g-12=0
We add all the numbers together, and all the variables
-6g-12=0
We move all terms containing g to the left, all other terms to the right
-6g=12
g=12/-6
g=-2
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