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18=7g-3
We move all terms to the left:
18-(7g-3)=0
We get rid of parentheses
-7g+3+18=0
We add all the numbers together, and all the variables
-7g+21=0
We move all terms containing g to the left, all other terms to the right
-7g=-21
g=-21/-7
g=+3
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