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5.1g+7=3.1g+15
We move all terms to the left:
5.1g+7-(3.1g+15)=0
We get rid of parentheses
5.1g-3.1g-15+7=0
We add all the numbers together, and all the variables
2g-8=0
We move all terms containing g to the left, all other terms to the right
2g=8
g=8/2
g=4
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