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(ln(5*x)/7)'The calculation above is a derivative of the function f (x)
((ln(5*x))'*7-(ln(5*x)*(7)'))/(7^2)
((1/(5*x))*(5*x)'*7-(ln(5*x)*(7)'))/(7^2)
((1/(5*x))*((5)'*x+5*(x)')*7-(ln(5*x)*(7)'))/(7^2)
((1/(5*x))*(0*x+5*(x)')*7-(ln(5*x)*(7)'))/(7^2)
((1/(5*x))*(0*x+5*1)*7-(ln(5*x)*(7)'))/(7^2)
(x^-1*7-(ln(5*x)*(7)'))/(7^2)
(x^-1*7-(ln(5*x)*0))/(7^2)
(x^-1)/7
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