us+un=r

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Solution for us+un=r equation: 


Simplifying
us + un = r

Reorder the terms:
nu + su = r

Solving
nu + su = r

Solving for variable 'n'.

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

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

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

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

Simplifying
n = ru-1 + -1s

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