-23=3u+9u-11u

Solution for -23=3u+9u-11u equation:

Simplifying
-23 = 3u + 9u + -11u

Combine like terms: 3u + 9u = 12u
-23 = 12u + -11u

Combine like terms: 12u + -11u = 1u
-23 = 1u

Solving
-23 = 1u

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.
-23 + -1u = 1u + -1u

Combine like terms: 1u + -1u = 0
-23 + -1u = 0

Add '23' to each side of the equation.
-23 + 23 + -1u = 0 + 23

Combine like terms: -23 + 23 = 0
0 + -1u = 0 + 23
-1u = 0 + 23

Combine like terms: 0 + 23 = 23
-1u = 23

Divide each side by '-1'.
u = -23

Simplifying
u = -23