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g/3+12=13
We move all terms to the left:
g/3+12-(13)=0
We add all the numbers together, and all the variables
g/3-1=0
We multiply all the terms by the denominator
g-1*3=0
We add all the numbers together, and all the variables
g-3=0
We move all terms containing g to the left, all other terms to the right
g=3
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