(3x-u+7)(7x+3u)=0

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Solution for (3x-u+7)(7x+3u)=0 equation: 


Simplifying
(3x + -1u + 7)(7x + 3u) = 0

Reorder the terms:
(7 + -1u + 3x)(7x + 3u) = 0

Reorder the terms:
(7 + -1u + 3x)(3u + 7x) = 0

Multiply (7 + -1u + 3x) * (3u + 7x)
(7(3u + 7x) + -1u * (3u + 7x) + 3x * (3u + 7x)) = 0
((3u * 7 + 7x * 7) + -1u * (3u + 7x) + 3x * (3u + 7x)) = 0
((21u + 49x) + -1u * (3u + 7x) + 3x * (3u + 7x)) = 0
(21u + 49x + (3u * -1u + 7x * -1u) + 3x * (3u + 7x)) = 0

Reorder the terms:
(21u + 49x + (-7ux + -3u2) + 3x * (3u + 7x)) = 0
(21u + 49x + (-7ux + -3u2) + 3x * (3u + 7x)) = 0
(21u + 49x + -7ux + -3u2 + (3u * 3x + 7x * 3x)) = 0
(21u + 49x + -7ux + -3u2 + (9ux + 21x2)) = 0

Reorder the terms:
(21u + -7ux + 9ux + -3u2 + 49x + 21x2) = 0

Combine like terms: -7ux + 9ux = 2ux
(21u + 2ux + -3u2 + 49x + 21x2) = 0

Solving
21u + 2ux + -3u2 + 49x + 21x2 = 0

Solving for variable 'u'.

The solution to this equation could not be determined.

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