18=u+9

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Solution for 18=u+9 equation:


Simplifying
18 = u + 9

Reorder the terms:
18 = 9 + u

Solving
18 = 9 + 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.
18 + -1u = 9 + u + -1u

Combine like terms: u + -1u = 0
18 + -1u = 9 + 0
18 + -1u = 9

Add '-18' to each side of the equation.
18 + -18 + -1u = 9 + -18

Combine like terms: 18 + -18 = 0
0 + -1u = 9 + -18
-1u = 9 + -18

Combine like terms: 9 + -18 = -9
-1u = -9

Divide each side by '-1'.
u = 9

Simplifying
u = 9

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