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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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