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6.1g+9=2.1g+29
We move all terms to the left:
6.1g+9-(2.1g+29)=0
We get rid of parentheses
6.1g-2.1g-29+9=0
We add all the numbers together, and all the variables
4g-20=0
We move all terms containing g to the left, all other terms to the right
4g=20
g=20/4
g=5
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