3u=-u

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Solution for 3u=-u equation: 


Simplifying
3u = -1u

Solving
3u = -1u

Solving for variable 'u'.

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

Add 'u' to each side of the equation.
3u + u = -1u + u

Combine like terms: 3u + u = 4u
4u = -1u + u

Combine like terms: -1u + u = 0
4u = 0

Divide each side by '4'.
u = 0

Simplifying
u = 0

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