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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-x-(2/x)-(3/x)-4-3 = x-x-(4/x)-(5/x)-6-5 // - x-x-(4/x)-(5/x)-6-5
x-x-x+x-(2/x)-(3/x)+4/x+5/x-4-3+5+6 = 0
x-x-x+x-2*x^-1-3*x^-1+4/x+5/x-4-3+5+6 = 0
4*x^-1 = -4 // : 4
x^-1 = -1
-1 < 0
1/(x^1) = -1 // * x^1
1 = -1*x^1 // : -1
-1 = x^1
x = -1
x = -1
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