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g/3+21=28
We move all terms to the left:
g/3+21-(28)=0
We add all the numbers together, and all the variables
g/3-7=0
We multiply all the terms by the denominator
g-7*3=0
We add all the numbers together, and all the variables
g-21=0
We move all terms containing g to the left, all other terms to the right
g=21
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