r+y=x

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Solution for r+y=x equation: 


Simplifying
r + y = x

Solving
r + y = x

Solving for variable 'r'.

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

Add '-1y' to each side of the equation.
r + y + -1y = x + -1y

Combine like terms: y + -1y = 0
r + 0 = x + -1y
r = x + -1y

Simplifying
r = x + -1y

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