6u=21-u

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Solution for 6u=21-u equation:


Simplifying
6u = 21 + -1u

Solving
6u = 21 + -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.
6u + u = 21 + -1u + u

Combine like terms: 6u + u = 7u
7u = 21 + -1u + u

Combine like terms: -1u + u = 0
7u = 21 + 0
7u = 21

Divide each side by '7'.
u = 3

Simplifying
u = 3

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