r-s+s-r=

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Solution for r-s+s-r= equation: 


Simplifying
r + -1s + s + -1r = 0

Reorder the terms:
r + -1r + -1s + s = 0

Combine like terms: r + -1r = 0
0 + -1s + s = 0
-1s + s = 0

Combine like terms: -1s + s = 0
0 = 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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