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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-(7/x)-2-2 = -1/3 // + -1/3
6/x-(7/x)-(-1/3)-2-2 = 0
6/x-7*x^-1+1/3-2-2 = 0
-1*x^-1 = 11/3 // : -1
x^-1 = -11/3
-1 < 0
1/(x^1) = -11/3 // * x^1
1 = -11/3*x^1 // : -11/3
-3/11 = x^1
x = -3/11
x = -3/11
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