K(r+u)=

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Solution for K(r+u)= equation: 


Simplifying
K(r + u) = 0
(r * K + u * K) = 0
(rK + uK) = 0

Solving
rK + uK = 0

Solving for variable 'r'.

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

Add '-1uK' to each side of the equation.
rK + uK + -1uK = 0 + -1uK

Combine like terms: uK + -1uK = 0
rK + 0 = 0 + -1uK
rK = 0 + -1uK
Remove the zero:
rK = -1uK

Divide each side by 'K'.
r = -1u

Simplifying
r = -1u

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