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12=g/2+9
We move all terms to the left:
12-(g/2+9)=0
We get rid of parentheses
-g/2-9+12=0
We multiply all the terms by the denominator
-g-9*2+12*2=0
We add all the numbers together, and all the variables
-1g+6=0
We move all terms containing g to the left, all other terms to the right
-g=-6
g=-6/-1
g=+6
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