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6.1g+7=2.1g+31
We move all terms to the left:
6.1g+7-(2.1g+31)=0
We get rid of parentheses
6.1g-2.1g-31+7=0
We add all the numbers together, and all the variables
4g-24=0
We move all terms containing g to the left, all other terms to the right
4g=24
g=24/4
g=6
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