r+u=o

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Solution for r+u=o equation: 


Simplifying
r + u = o

Solving
r + u = o

Solving for variable 'r'.

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

Add '-1u' to each side of the equation.
r + u + -1u = o + -1u

Combine like terms: u + -1u = 0
r + 0 = o + -1u
r = o + -1u

Simplifying
r = o + -1u

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