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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-3/7 = 6/x+6 // - 6/x+6
-(6/x)-3/7-6 = 0
-6*x^-1-3/7-6 = 0
-6*x^-1 = 45/7 // : -6
x^-1 = -15/14
-1 < 0
1/(x^1) = -15/14 // * x^1
1 = -15/14*x^1 // : -15/14
-14/15 = x^1
x = -14/15
x = -14/15
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