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f(-5)=5(-5)-5
We move all terms to the left:
f(-5)-(5(-5)-5)=0
We add all the numbers together, and all the variables
f(-5)+30=0
We multiply parentheses
-5f+30=0
We move all terms containing f to the left, all other terms to the right
-5f=-30
f=-30/-5
f=+6
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