11=u-9

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Solution for 11=u-9 equation: 


Simplifying
11 = u + -9

Reorder the terms:
11 = -9 + u

Solving
11 = -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.
11 + -1u = -9 + u + -1u

Combine like terms: u + -1u = 0
11 + -1u = -9 + 0
11 + -1u = -9

Add '-11' to each side of the equation.
11 + -11 + -1u = -9 + -11

Combine like terms: 11 + -11 = 0
0 + -1u = -9 + -11
-1u = -9 + -11

Combine like terms: -9 + -11 = -20
-1u = -20

Divide each side by '-1'.
u = 20

Simplifying
u = 20

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