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8g=5g+21
We move all terms to the left:
8g-(5g+21)=0
We get rid of parentheses
8g-5g-21=0
We add all the numbers together, and all the variables
3g-21=0
We move all terms containing g to the left, all other terms to the right
3g=21
g=21/3
g=7
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