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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/15 = 4/x-5 // - 4/x-5
10/15-(4/x)+5 = 0
10/15-4*x^-1+5 = 0
-4*x^-1 = -17/3 // : -4
x^-1 = 17/12
-1 < 0
1/(x^1) = 17/12 // * x^1
1 = 17/12*x^1 // : 17/12
12/17 = x^1
x = 12/17
x = 12/17
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