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4.2g+3=1.2g+9
We move all terms to the left:
4.2g+3-(1.2g+9)=0
We get rid of parentheses
4.2g-1.2g-9+3=0
We add all the numbers together, and all the variables
3g-6=0
We move all terms containing g to the left, all other terms to the right
3g=6
g=6/3
g=2
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