xu-3u-7x+21=0

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Solution for xu-3u-7x+21=0 equation:


Simplifying
xu + -3u + -7x + 21 = 0

Reorder the terms:
21 + -3u + ux + -7x = 0

Solving
21 + -3u + ux + -7x = 0

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 + -3u + ux + -21 + -7x = 0 + -21

Reorder the terms:
21 + -21 + -3u + ux + -7x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -3u + ux + -7x = 0 + -21
-3u + ux + -7x = 0 + -21

Combine like terms: 0 + -21 = -21
-3u + ux + -7x = -21

Add '7x' to each side of the equation.
-3u + ux + -7x + 7x = -21 + 7x

Combine like terms: -7x + 7x = 0
-3u + ux + 0 = -21 + 7x
-3u + ux = -21 + 7x

Reorder the terms:
21 + -3u + ux + -7x = -21 + 7x + 21 + -7x

Reorder the terms:
21 + -3u + ux + -7x = -21 + 21 + 7x + -7x

Combine like terms: -21 + 21 = 0
21 + -3u + ux + -7x = 0 + 7x + -7x
21 + -3u + ux + -7x = 7x + -7x

Combine like terms: 7x + -7x = 0
21 + -3u + ux + -7x = 0

The solution to this equation could not be determined.

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