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6.9g+7=3.9g+13
We move all terms to the left:
6.9g+7-(3.9g+13)=0
We get rid of parentheses
6.9g-3.9g-13+7=0
We add all the numbers together, and all the variables
3g-6=0
We move all terms containing g to the left, all other terms to the right
3g=6
g=6/3
g=2
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