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