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7g+12=21+g=
We move all terms to the left:
7g+12-(21+g)=0
We add all the numbers together, and all the variables
7g-(g+21)+12=0
We get rid of parentheses
7g-g-21+12=0
We add all the numbers together, and all the variables
6g-9=0
We move all terms containing g to the left, all other terms to the right
6g=9
g=9/6
g=1+1/2
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