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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.5/11 = 4/x // - 4/x
1.5/11-(4/x) = 0
1.5/11-4*x^-1 = 0
-4*x^-1 = -0.13636364 // : -4
x^-1 = 0.03409091
-1 < 0
1/(x^1) = 0.03409091 // * x^1
1 = 0.03409091*x^1 // : 0.03409091
29.33333255 = x^1
x = 29.33333255
x = 29.33333255
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