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15=-3+2g
We move all terms to the left:
15-(-3+2g)=0
We add all the numbers together, and all the variables
-(2g-3)+15=0
We get rid of parentheses
-2g+3+15=0
We add all the numbers together, and all the variables
-2g+18=0
We move all terms containing g to the left, all other terms to the right
-2g=-18
g=-18/-2
g=+9
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