r(r)=1

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Solution for r(r)=1 equation: 


Simplifying
r(r) = 1

Multiply r * r
r2 = 1

Solving
r2 = 1

Solving for variable 'r'.

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

Simplifying
r2 = 1

Take the square root of each side:
r = {-1, 1}

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