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15=g/3+13
We move all terms to the left:
15-(g/3+13)=0
We get rid of parentheses
-g/3-13+15=0
We multiply all the terms by the denominator
-g-13*3+15*3=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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