21=9-2u

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Solution for 21=9-2u equation: 


Simplifying
21 = 9 + -2u

Solving
21 = 9 + -2u

Solving for variable 'u'.

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

Add '2u' to each side of the equation.
21 + 2u = 9 + -2u + 2u

Combine like terms: -2u + 2u = 0
21 + 2u = 9 + 0
21 + 2u = 9

Add '-21' to each side of the equation.
21 + -21 + 2u = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 2u = 9 + -21
2u = 9 + -21

Combine like terms: 9 + -21 = -12
2u = -12

Divide each side by '2'.
u = -6

Simplifying
u = -6

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