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4.2g+3=2.2g+15
We move all terms to the left:
4.2g+3-(2.2g+15)=0
We get rid of parentheses
4.2g-2.2g-15+3=0
We add all the numbers together, and all the variables
2g-12=0
We move all terms containing g to the left, all other terms to the right
2g=12
g=12/2
g=6
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