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-3(g+20)=-18
We move all terms to the left:
-3(g+20)-(-18)=0
We add all the numbers together, and all the variables
-3(g+20)+18=0
We multiply parentheses
-3g-60+18=0
We add all the numbers together, and all the variables
-3g-42=0
We move all terms containing g to the left, all other terms to the right
-3g=42
g=42/-3
g=-14
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