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