up+un=r

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Solution for up+un=r equation: 


Simplifying
up + un = r

Reorder the terms:
nu + pu = r

Solving
nu + pu = r

Solving for variable 'n'.

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

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

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

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

Simplifying
n = -1p + ru-1

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