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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(-13*x^2)/x-((14*x^2)/x)-1-1-1 = 0
(-13*x^2)/x-14*x-1-1-1 = 0
-27*x-3 = 0 // + 3
-27*x = 3 // : -27
x = 3/(-27)
x = -1/9
x = -1/9
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