f(2.5)=80-15(2,5)

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Solution for f(2.5)=80-15(2,5) equation: 



f(2.5)=80-15(2.5)

We move all terms to the left:

f(2.5)-(80-15(2.5))=0

We add all the numbers together, and all the variables

f(2.5)-42.5=0

We multiply parentheses

2.5f-42.5=0

We move all terms containing f to the left, all other terms to the right

2.5f=42.5

f=42.5/2.5

f=17

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