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g/6+12=21
We move all terms to the left:
g/6+12-(21)=0
We add all the numbers together, and all the variables
g/6-9=0
We multiply all the terms by the denominator
g-9*6=0
We add all the numbers together, and all the variables
g-54=0
We move all terms containing g to the left, all other terms to the right
g=54
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