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(3/(x^-7))'The calculation above is a derivative of the function f (x)
((3)'*x^-7-(3*(x^-7)'))/((x^-7)^2)
(0*x^-7-(3*(x^-7)'))/((x^-7)^2)
(0*x^-7-(3*-7*x^(-7-1)))/((x^-7)^2)
(0*x^-7-(3*-7*x^-8))/((x^-7)^2)
21*x^6
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