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(14/(5*x))'The calculation above is a derivative of the function f (x)
((14)'*5*x-(14*(5*x)'))/((5*x)^2)
(0*5*x-(14*(5*x)'))/((5*x)^2)
(0*5*x-(14*((5)'*x+5*(x)')))/((5*x)^2)
(0*5*x-(14*(0*x+5*(x)')))/((5*x)^2)
(0*5*x-(14*(0*x+5*1)))/((5*x)^2)
(0*5*x-(14*5))/((5*x)^2)
(-14*x^-2)/5
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