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3.9g+6=1.9g+12
We move all terms to the left:
3.9g+6-(1.9g+12)=0
We get rid of parentheses
3.9g-1.9g-12+6=0
We add all the numbers together, and all the variables
2g-6=0
We move all terms containing g to the left, all other terms to the right
2g=6
g=6/2
g=3
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