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f(-6)=-6^2
We move all terms to the left:
f(-6)-(-6^2)=0
We add all the numbers together, and all the variables
f(-6)+36=0
We multiply parentheses
-6f+36=0
We move all terms containing f to the left, all other terms to the right
-6f=-36
f=-36/-6
f=+6
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