3u+u=12

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Solution for 3u+u=12 equation: 


Simplifying
3u + u = 12

Combine like terms: 3u + u = 4u
4u = 12

Solving
4u = 12

Solving for variable 'u'.

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

Divide each side by '4'.
u = 3

Simplifying
u = 3

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