-1+9u=8u

Solution for -1+9u=8u equation:

Simplifying
-1 + 9u = 8u

Solving
-1 + 9u = 8u

Solving for variable 'u'.

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

Add '-8u' to each side of the equation.
-1 + 9u + -8u = 8u + -8u

Combine like terms: 9u + -8u = 1u
-1 + 1u = 8u + -8u

Combine like terms: 8u + -8u = 0
-1 + 1u = 0

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

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

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

Divide each side by '1'.
u = 1

Simplifying
u = 1