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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-(3/x)-4+1 = 6/x-1 // - 6/x-1
2/x-(3/x)-(6/x)-4+1+1 = 0
2/x-3*x^-1-6*x^-1-4+1+1 = 0
-7*x^-1 = 2 // : -7
x^-1 = -2/7
-1 < 0
1/(x^1) = -2/7 // * x^1
1 = -2/7*x^1 // : -2/7
-7/2 = x^1
x = -7/2
x = -7/2
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