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18=-9+g/2
We move all terms to the left:
18-(-9+g/2)=0
We add all the numbers together, and all the variables
-(g/2-9)+18=0
We get rid of parentheses
-g/2+9+18=0
We multiply all the terms by the denominator
-g+9*2+18*2=0
We add all the numbers together, and all the variables
-1g+54=0
We move all terms containing g to the left, all other terms to the right
-g=-54
g=-54/-1
g=+54
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