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f(-5)=17(-5)-7
We move all terms to the left:
f(-5)-(17(-5)-7)=0
We add all the numbers together, and all the variables
f(-5)+92=0
We multiply parentheses
-5f+92=0
We move all terms containing f to the left, all other terms to the right
-5f=-92
f=-92/-5
f=18+2/5
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