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