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5.8g+9=3.9g+21
We move all terms to the left:
5.8g+9-(3.9g+21)=0
We get rid of parentheses
5.8g-3.9g-21+9=0
We add all the numbers together, and all the variables
1.9g-12=0
We move all terms containing g to the left, all other terms to the right
1.9g=12
g=12/1.9
g=6+0.6/1.9
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