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