21-u=17

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Solution for 21-u=17 equation: 


Simplifying
21 + -1u = 17

Solving
21 + -1u = 17

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 + -1u = 17 + -21

Combine like terms: 21 + -21 = 0
0 + -1u = 17 + -21
-1u = 17 + -21

Combine like terms: 17 + -21 = -4
-1u = -4

Divide each side by '-1'.
u = 4

Simplifying
u = 4

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