81=u+8u

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Solution for 81=u+8u equation:


Simplifying
81 = u + 8u

Combine like terms: u + 8u = 9u
81 = 9u

Solving
81 = 9u

Solving for variable 'u'.

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

Add '-9u' to each side of the equation.
81 + -9u = 9u + -9u

Combine like terms: 9u + -9u = 0
81 + -9u = 0

Add '-81' to each side of the equation.
81 + -81 + -9u = 0 + -81

Combine like terms: 81 + -81 = 0
0 + -9u = 0 + -81
-9u = 0 + -81

Combine like terms: 0 + -81 = -81
-9u = -81

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

Simplifying
u = 9

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