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5.9g+3=2.9g+21
We move all terms to the left:
5.9g+3-(2.9g+21)=0
We get rid of parentheses
5.9g-2.9g-21+3=0
We add all the numbers together, and all the variables
3g-18=0
We move all terms containing g to the left, all other terms to the right
3g=18
g=18/3
g=6
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