-9=-6+u

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Solution for -9=-6+u equation: 


Simplifying
-9 = -6 + u

Solving
-9 = -6 + 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.
-9 + -1u = -6 + u + -1u

Combine like terms: u + -1u = 0
-9 + -1u = -6 + 0
-9 + -1u = -6

Add '9' to each side of the equation.
-9 + 9 + -1u = -6 + 9

Combine like terms: -9 + 9 = 0
0 + -1u = -6 + 9
-1u = -6 + 9

Combine like terms: -6 + 9 = 3
-1u = 3

Divide each side by '-1'.
u = -3

Simplifying
u = -3

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