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