21=3xu

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Solution for 21=3xu equation:


Simplifying
21 = 3xu

Solving
21 = 3ux

Solving for variable 'u'.

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

Add '-3ux' to each side of the equation.
21 + -3ux = 3ux + -3ux

Combine like terms: 3ux + -3ux = 0
21 + -3ux = 0

Add '-21' to each side of the equation.
21 + -21 + -3ux = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -3ux = 0 + -21
-3ux = 0 + -21

Combine like terms: 0 + -21 = -21
-3ux = -21

Divide each side by '-3x'.
u = 7x-1

Simplifying
u = 7x-1

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