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f(-25)=-3+8
We move all terms to the left:
f(-25)-(-3+8)=0
We add all the numbers together, and all the variables
f(-25)-5=0
We multiply parentheses
-25f-5=0
We move all terms containing f to the left, all other terms to the right
-25f=5
f=5/-25
f=-1/5
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