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g(-4)=5(-4)+12
We move all terms to the left:
g(-4)-(5(-4)+12)=0
We add all the numbers together, and all the variables
g(-4)+8=0
We multiply parentheses
-4g+8=0
We move all terms containing g to the left, all other terms to the right
-4g=-8
g=-8/-4
g=+2
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