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21g=6g+45
We move all terms to the left:
21g-(6g+45)=0
We get rid of parentheses
21g-6g-45=0
We add all the numbers together, and all the variables
15g-45=0
We move all terms containing g to the left, all other terms to the right
15g=45
g=45/15
g=3
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