21=2u-9

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Solution for 21=2u-9 equation:


Simplifying
21 = 2u + -9

Reorder the terms:
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 = -30
-2u = -30

Divide each side by '-2'.
u = 15

Simplifying
u = 15

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