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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 1/4+1/3+1/5 // - 1/4+1/3+1/5
1/x-(1/4)-(1/3)-(1/5) = 0
1/x-1/4-1/3-1/5 = 0
1*x^-1 = 47/60 // : 1
x^-1 = 47/60
-1 < 0
1/(x^1) = 47/60 // * x^1
1 = 47/60*x^1 // : 47/60
60/47 = x^1
x = 60/47
x = 60/47
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