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f(-6)=-14
We move all terms to the left:
f(-6)-(-14)=0
We add all the numbers together, and all the variables
f(-6)+14=0
We multiply parentheses
-6f+14=0
We move all terms containing f to the left, all other terms to the right
-6f=-14
f=-14/-6
f=2+1/3
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