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Given that x^2+5x-14 is a factor of x^4-2x^3-37x^2+kx-168, 
evaluate the sum of the four roots of the equation: x^4-2x^3-37x^2+kx-168=0. 
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Independently from any other "given" parts of the problem,
    the sum of the roots of the equation  x^4 - 2x^3 - 37x^2 + kx - 168 = 0 is equal to its coefficient at x^3 
    taken with the opposite sign, i.e. +2.    (Based on the Vieta's theorem)
ANSWER.  The sum of the roots of the equation  x^4 - 2x^3 - 37x^2 + kx - 168 = 0  is  2.
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