f(r)=r

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Solution for f(r)=r equation: 


Simplifying
f(r) = r

Multiply f * r
fr = r

Solving
fr = r

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'r'.
f = 1

Simplifying
f = 1

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