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6.9g+6=1.9g+31
We move all terms to the left:
6.9g+6-(1.9g+31)=0
We get rid of parentheses
6.9g-1.9g-31+6=0
We add all the numbers together, and all the variables
5g-25=0
We move all terms containing g to the left, all other terms to the right
5g=25
g=25/5
g=5
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