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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.5 = 10/x // - 10/x
1.5-(10/x) = 0
1.5-10*x^-1 = 0
-10*x^-1 = -1.5 // : -10
x^-1 = 0.15
-1 < 0
1/(x^1) = 0.15 // * x^1
1 = 0.15*x^1 // : 0.15
6.66666667 = x^1
x = 6.66666667
x = 6.66666667
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