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21=-16+g
We move all terms to the left:
21-(-16+g)=0
We add all the numbers together, and all the variables
-(g-16)+21=0
We get rid of parentheses
-g+16+21=0
We add all the numbers together, and all the variables
-1g+37=0
We move all terms containing g to the left, all other terms to the right
-g=-37
g=-37/-1
g=+37
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