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3.9g+8=1.9g+20
We move all terms to the left:
3.9g+8-(1.9g+20)=0
We get rid of parentheses
3.9g-1.9g-20+8=0
We add all the numbers together, and all the variables
2g-12=0
We move all terms containing g to the left, all other terms to the right
2g=12
g=12/2
g=6
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