99+6u=-3u

Solution for 99+6u=-3u equation:

Simplifying
99 + 6u = -3u

Solving
99 + 6u = -3u

Solving for variable 'u'.

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

Add '3u' to each side of the equation.
99 + 6u + 3u = -3u + 3u

Combine like terms: 6u + 3u = 9u
99 + 9u = -3u + 3u

Combine like terms: -3u + 3u = 0
99 + 9u = 0

Add '-99' to each side of the equation.
99 + -99 + 9u = 0 + -99

Combine like terms: 99 + -99 = 0
0 + 9u = 0 + -99
9u = 0 + -99

Combine like terms: 0 + -99 = -99
9u = -99

Divide each side by '9'.
u = -11

Simplifying
u = -11