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g(-3)=9+(-15)
We move all terms to the left:
g(-3)-(9+(-15))=0
We add all the numbers together, and all the variables
g(-3)+6=0
We multiply parentheses
-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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