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12-3g+3g+3g-6g=18
We move all terms to the left:
12-3g+3g+3g-6g-(18)=0
We add all the numbers together, and all the variables
-3g-6=0
We move all terms containing g to the left, all other terms to the right
-3g=6
g=6/-3
g=-2
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