6+3u=u

Solution for 6+3u=u equation:

Simplifying
6 + 3u = u

Solving
6 + 3u = 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.
6 + 3u + -1u = u + -1u

Combine like terms: 3u + -1u = 2u
6 + 2u = u + -1u

Combine like terms: u + -1u = 0
6 + 2u = 0

Add '-6' to each side of the equation.
6 + -6 + 2u = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 2u = 0 + -6
2u = 0 + -6

Combine like terms: 0 + -6 = -6
2u = -6

Divide each side by '2'.
u = -3

Simplifying
u = -3