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7=g-84/2
We move all terms to the left:
7-(g-84/2)=0
We add all the numbers together, and all the variables
-(g-42)+7=0
We get rid of parentheses
-g+42+7=0
We add all the numbers together, and all the variables
-1g+49=0
We move all terms containing g to the left, all other terms to the right
-g=-49
g=-49/-1
g=+49
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