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13=7+3g
We move all terms to the left:
13-(7+3g)=0
We add all the numbers together, and all the variables
-(3g+7)+13=0
We get rid of parentheses
-3g-7+13=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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