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((12*x+23)/x)'The calculation above is a derivative of the function f (x)
((12*x+23)'*x-((12*x+23)*(x)'))/(x^2)
(((12*x)'+(23)')*x-((12*x+23)*(x)'))/(x^2)
((12*(x)'+(12)'*x+(23)')*x-((12*x+23)*(x)'))/(x^2)
((12*(x)'+0*x+(23)')*x-((12*x+23)*(x)'))/(x^2)
((0*x+12*1+(23)')*x-((12*x+23)*(x)'))/(x^2)
((0+12)*x-((12*x+23)*(x)'))/(x^2)
(12*x-((12*x+23)*(x)'))/(x^2)
(12*x-((12*x+23)*1))/(x^2)
-23/(x^2)
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