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f(2.5)=-16(2.5)+(80)(2.5)
We move all terms to the left:
f(2.5)-(-16(2.5)+(80)(2.5))=0
We add all the numbers together, and all the variables
f(2.5)-160=0
We multiply parentheses
2.5f-160=0
We move all terms containing f to the left, all other terms to the right
2.5f=160
f=160/2.5
f=64
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