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g(-2)=3(-2)-8
We move all terms to the left:
g(-2)-(3(-2)-8)=0
We add all the numbers together, and all the variables
g(-2)+14=0
We multiply parentheses
-2g+14=0
We move all terms containing g to the left, all other terms to the right
-2g=-14
g=-14/-2
g=+7
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