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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.5 = 15/x // - 15/x
4.5-(15/x) = 0
4.5-15*x^-1 = 0
-15*x^-1 = -4.5 // : -15
x^-1 = 0.3
-1 < 0
1/(x^1) = 0.3 // * x^1
1 = 0.3*x^1 // : 0.3
3.33333333 = x^1
x = 3.33333333
x = 3.33333333
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