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21=g/4-19
We move all terms to the left:
21-(g/4-19)=0
We get rid of parentheses
-g/4+19+21=0
We multiply all the terms by the denominator
-g+19*4+21*4=0
We add all the numbers together, and all the variables
-1g+160=0
We move all terms containing g to the left, all other terms to the right
-g=-160
g=-160/-1
g=+160
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