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g(-4)=-7-13
We move all terms to the left:
g(-4)-(-7-13)=0
We add all the numbers together, and all the variables
g(-4)-(-20)=0
We add all the numbers together, and all the variables
g(-4)+20=0
We multiply parentheses
-4g+20=0
We move all terms containing g to the left, all other terms to the right
-4g=-20
g=-20/-4
g=+5
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