F(r)=25-r

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Solution for F(r)=25-r equation: 



(F)=25-F

We move all terms to the left:

(F)-(25-F)=0

We add all the numbers together, and all the variables

F-(-1F+25)=0

We get rid of parentheses

F+1F-25=0

We add all the numbers together, and all the variables

2F-25=0

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

2F=25

F=25/2

F=12+1/2

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