f(1)=5,f-1(5)

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Solution for f(1)=5,f-1(5) equation: 



f(1)=5.f-1(5)

We move all terms to the left:

f(1)-(5.f-1(5))=0

We add all the numbers together, and all the variables

f-(5.f-15)=0

We get rid of parentheses

f-5.f+15=0

We add all the numbers together, and all the variables

-4f+15=0

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

-4f=-15

f=-15/-4

f=3+3/4

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