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