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3.9g-17.9=-2.3
We move all terms to the left:
3.9g-17.9-(-2.3)=0
We add all the numbers together, and all the variables
3.9g-15.6=0
We move all terms containing g to the left, all other terms to the right
3.9g=15.6
g=15.6/3.9
g=4
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