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