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D( x )
3*x = 0
5*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
2/(5*x)-(5/(3*x)) = 4 // - 4
2/(5*x)-(5/(3*x))-4 = 0
2/(5*x)+(-5/3)*x^-1-4 = 0
-19/15*x^-1 = 4 // : -19/15
x^-1 = -60/19
-1 < 0
1/(x^1) = -60/19 // * x^1
1 = -60/19*x^1 // : -60/19
-19/60 = x^1
x = -19/60
x = -19/60
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