x^4+4x-21=0

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Solution for x^4+4x-21=0 equation: 


Simplifying
x4 + 4x + -21 = 0

Reorder the terms:
-21 + 4x + x4 = 0

Solving
-21 + 4x + x4 = 0

Solving for variable 'x'.

The solution to this equation could not be determined.

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