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5.1g+3=2.1g+9
We move all terms to the left:
5.1g+3-(2.1g+9)=0
We get rid of parentheses
5.1g-2.1g-9+3=0
We add all the numbers together, and all the variables
3g-6=0
We move all terms containing g to the left, all other terms to the right
3g=6
g=6/3
g=2
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