21=u-9

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Solution for 21=u-9 equation:


Simplifying
21 = u + -9

Reorder the terms:
21 = -9 + u

Solving
21 = -9 + u

Solving for variable 'u'.

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

Add '-1u' to each side of the equation.
21 + -1u = -9 + u + -1u

Combine like terms: u + -1u = 0
21 + -1u = -9 + 0
21 + -1u = -9

Add '-21' to each side of the equation.
21 + -21 + -1u = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -1u = -9 + -21
-1u = -9 + -21

Combine like terms: -9 + -21 = -30
-1u = -30

Divide each side by '-1'.
u = 30

Simplifying
u = 30

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