18-u=9

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Solution for 18-u=9 equation: 


Simplifying
18 + -1u = 9

Solving
18 + -1u = 9

Solving for variable 'u'.

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

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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