X+x=r

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Solution for X+x=r equation: 


Simplifying
X + x = r

Solving
X + x = r

Solving for variable 'X'.

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

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

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

Simplifying
X = r + -1x

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