4u=21+u

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Solution for 4u=21+u equation: 


Simplifying
4u = 21 + u

Solving
4u = 21 + u

Solving for variable 'u'.

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

Add '-1u' to each side of the equation.
4u + -1u = 21 + u + -1u

Combine like terms: 4u + -1u = 3u
3u = 21 + u + -1u

Combine like terms: u + -1u = 0
3u = 21 + 0
3u = 21

Divide each side by '3'.
u = 7

Simplifying
u = 7

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