-1=6+u

Solution for -1=6+u equation:

Simplifying
-1 = 6 + u

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

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

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

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

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

Divide each side by '-1'.
u = -7

Simplifying
u = -7