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