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5.7g+9=2.7g+21
We move all terms to the left:
5.7g+9-(2.7g+21)=0
We get rid of parentheses
5.7g-2.7g-21+9=0
We add all the numbers together, and all the variables
3g-12=0
We move all terms containing g to the left, all other terms to the right
3g=12
g=12/3
g=4
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