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g=0.16g+21
We move all terms to the left:
g-(0.16g+21)=0
We get rid of parentheses
g-0.16g-21=0
We add all the numbers together, and all the variables
0.84g-21=0
We move all terms containing g to the left, all other terms to the right
0.84g=21
g=21/0.84
g=25
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