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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/x-2 = (13*x^2)/x-2+5 // - (13*x^2)/x-2+5
(2*x)/x-((13*x^2)/x)-5-2+2 = 0
(2*x)/x-13*x-5-2+2 = 0
-13*x-3 = 0 // + 3
-13*x = 3 // : -13
x = 3/(-13)
x = -3/13
x = -3/13
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