u-4=9

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Solution for u-4=9 equation: 


Simplifying
u + -4 = 9

Reorder the terms:
-4 + u = 9

Solving
-4 + u = 9

Solving for variable 'u'.

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

Add '4' to each side of the equation.
-4 + 4 + u = 9 + 4

Combine like terms: -4 + 4 = 0
0 + u = 9 + 4
u = 9 + 4

Combine like terms: 9 + 4 = 13
u = 13

Simplifying
u = 13

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