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12+2g=-18-13g
We move all terms to the left:
12+2g-(-18-13g)=0
We add all the numbers together, and all the variables
2g-(-13g-18)+12=0
We get rid of parentheses
2g+13g+18+12=0
We add all the numbers together, and all the variables
15g+30=0
We move all terms containing g to the left, all other terms to the right
15g=-30
g=-30/15
g=-2
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