un+us=x

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Solution for un+us=x equation: 


Simplifying
un + us = x

Solving
nu + su = x

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 = -1su + x

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

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

Simplifying
n = -1s + u-1x

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