uk+un=r

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Solution for uk+un=r equation: 


Simplifying
uk + un = r

Solving
ku + nu = r

Solving for variable 'k'.

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

Add '-1nu' to each side of the equation.
ku + nu + -1nu = -1nu + r

Combine like terms: nu + -1nu = 0
ku + 0 = -1nu + r
ku = -1nu + r

Divide each side by 'u'.
k = -1n + ru-1

Simplifying
k = -1n + ru-1

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