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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x^2-(13*x))/x = 0
(6*x^2-13*x)/x = 0
6*x^2-13*x = 0
x*(6*x-13) = 0
6*x-13 = 0 // + 13
6*x = 13 // : 6
x = 13/6
x*(x-13/6) = 0
x-13/6 = 0
x-13/6 = 0 // + 13/6
x = 13/6
x = 13/6
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