Question: How can solve the equation x^(4)-12*x-12=0

how we solve x^(4)-12*x-12=0, 

mapple sent after solving: RootOf(_Z^4 - 12*_Z - 12, index = 1), RootOf(_Z^4 - 12*_Z - 12, index = 2), RootOf(_Z^4 - 12*_Z - 12, index = 3), RootOf(_Z^4 - 12*_Z - 12, index = 4)

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