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3(2g+9)=75
We move all terms to the left:
3(2g+9)-(75)=0
We multiply parentheses
6g+27-75=0
We add all the numbers together, and all the variables
6g-48=0
We move all terms containing g to the left, all other terms to the right
6g=48
g=48/6
g=8
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