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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(5/x) = 2/0.3 // - 2/0.3
1-(5/x)-(2/0.3) = 0
1-5*x^-1-6.66666667 = 0
-5*x^-1 = 5.66666667 // : -5
x^-1 = -1.13333333
-1 < 0
1/(x^1) = -1.13333333 // * x^1
1 = -1.13333333*x^1 // : -1.13333333
-0.88235294 = x^1
x = -0.88235294
x = -0.88235294
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