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10g-21=5g+69
We move all terms to the left:
10g-21-(5g+69)=0
We get rid of parentheses
10g-5g-69-21=0
We add all the numbers together, and all the variables
5g-90=0
We move all terms containing g to the left, all other terms to the right
5g=90
g=90/5
g=18
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