u-9=-1

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Solution for u-9=-1 equation: 


Simplifying
u + -9 = -1

Reorder the terms:
-9 + u = -1

Solving
-9 + u = -1

Solving for variable 'u'.

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

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

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

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

Simplifying
u = 8

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