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