(r-1)(1-1)=0

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Solution for (r-1)(1-1)=0 equation: 


Simplifying
(r + -1)(1 + -1) = 0

Reorder the terms:
(-1 + r)(1 + -1) = 0

Combine like terms: 1 + -1 = 0
(-1 + r)(0) = 0

Reorder the terms for easier multiplication:
0(-1 + r) = 0

Anything times zero is zero.
0(-1 + r) = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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