[u]-15=-9

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Solution for [u]-15=-9 equation: 


Simplifying
[u] + -15 = -9
u + -15 = -9

Reorder the terms:
-15 + u = -9

Solving
-15 + u = -9

Solving for variable 'u'.

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

Add '15' to each side of the equation.
-15 + 15 + u = -9 + 15

Combine like terms: -15 + 15 = 0
0 + u = -9 + 15
u = -9 + 15

Combine like terms: -9 + 15 = 6
u = 6

Simplifying
u = 6

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