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-(5g+12)=18
We move all terms to the left:
-(5g+12)-(18)=0
We get rid of parentheses
-5g-12-18=0
We add all the numbers together, and all the variables
-5g-30=0
We move all terms containing g to the left, all other terms to the right
-5g=30
g=30/-5
g=-6
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