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9=5g-21
We move all terms to the left:
9-(5g-21)=0
We get rid of parentheses
-5g+21+9=0
We add all the numbers together, and all the variables
-5g+30=0
We move all terms containing g to the left, all other terms to the right
-5g=-30
g=-30/-5
g=+6
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