u+21=4

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Solution for u+21=4 equation: 


Simplifying
u + 21 = 4

Reorder the terms:
21 + u = 4

Solving
21 + u = 4

Solving for variable 'u'.

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

Add '-21' to each side of the equation.
21 + -21 + u = 4 + -21

Combine like terms: 21 + -21 = 0
0 + u = 4 + -21
u = 4 + -21

Combine like terms: 4 + -21 = -17
u = -17

Simplifying
u = -17

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