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3=g/2+1
We move all terms to the left:
3-(g/2+1)=0
We get rid of parentheses
-g/2-1+3=0
We multiply all the terms by the denominator
-g-1*2+3*2=0
We add all the numbers together, and all the variables
-1g+4=0
We move all terms containing g to the left, all other terms to the right
-g=-4
g=-4/-1
g=+4
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