6=10-(-u)

Solution for 6=10-(-u) equation:

Simplifying
6 = 10 + -1(-1u)

Remove parenthesis around (-1u)
6 = 10 + -1 * -1u

Multiply -1 * -1
6 = 10 + 1u

Solving
6 = 10 + 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.
6 + -1u = 10 + 1u + -1u

Combine like terms: 1u + -1u = 0
6 + -1u = 10 + 0
6 + -1u = 10

Add '-6' to each side of the equation.
6 + -6 + -1u = 10 + -6

Combine like terms: 6 + -6 = 0
0 + -1u = 10 + -6
-1u = 10 + -6

Combine like terms: 10 + -6 = 4
-1u = 4

Divide each side by '-1'.
u = -4

Simplifying
u = -4