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g/2+11=21
We move all terms to the left:
g/2+11-(21)=0
We add all the numbers together, and all the variables
g/2-10=0
We multiply all the terms by the denominator
g-10*2=0
We add all the numbers together, and all the variables
g-20=0
We move all terms containing g to the left, all other terms to the right
g=20
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