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20=g/3+13
We move all terms to the left:
20-(g/3+13)=0
We get rid of parentheses
-g/3-13+20=0
We multiply all the terms by the denominator
-g-13*3+20*3=0
We add all the numbers together, and all the variables
-1g+21=0
We move all terms containing g to the left, all other terms to the right
-g=-21
g=-21/-1
g=+21
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