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D( x )
3*x = 0
4*x = 0
2*x = 0
5*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
1/(2*x)-(1/(3*x))+1/(4*x)-(1/(5*x)) = 1 // - 1
1/(2*x)-(1/(3*x))+1/(4*x)-(1/(5*x))-1 = 0
1/(2*x)+(-1/3)*x^-1+1/(4*x)+(-1/5)*x^-1-1 = 0
13/60*x^-1 = 1 // : 13/60
x^-1 = 60/13
-1 < 0
1/(x^1) = 60/13 // * x^1
1 = 60/13*x^1 // : 60/13
13/60 = x^1
x = 13/60
x = 13/60
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