x+u=90

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Solution for x+u=90 equation: 


Simplifying
x + u = 90

Reorder the terms:
u + x = 90

Solving
u + x = 90

Solving for variable 'u'.

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

Add '-1x' to each side of the equation.
u + x + -1x = 90 + -1x

Combine like terms: x + -1x = 0
u + 0 = 90 + -1x
u = 90 + -1x

Simplifying
u = 90 + -1x

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