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g(-1)=-2(-1)+1
We move all terms to the left:
g(-1)-(-2(-1)+1)=0
We add all the numbers together, and all the variables
g(-1)-3=0
We multiply parentheses
-1g-3=0
We move all terms containing g to the left, all other terms to the right
-g=3
g=3/-1
g=-3
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