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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.5/6 = 10/x // - 10/x
1.5/6-(10/x) = 0
1.5/6-10*x^-1 = 0
-10*x^-1 = -0.25 // : -10
x^-1 = 0.025
-1 < 0
1/(x^1) = 0.025 // * x^1
1 = 0.025*x^1 // : 0.025
40 = x^1
x = 40
x = 40
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