X+a=Un

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Solution for X+a=Un equation: 


Simplifying
X + a = Un

Solving
X + a = nU

Solving for variable 'X'.

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

Add '-1a' to each side of the equation.
X + a + -1a = -1a + nU

Combine like terms: a + -1a = 0
X + 0 = -1a + nU
X = -1a + nU

Simplifying
X = -1a + nU

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