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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(6/x)-7 = 2 // - 2
X-(6/x)-7-2 = 0
X-6*x^-1-7-2 = 0
-6*x^-1 = -(X-9) // : -6
x^-1 = (9-X)/(-6)
-1 < 0
1/(x^1) = (9-X)/(-6) // * x^1
1 = x^1*((9-X)/(-6)) // : (9-X)/(-6)
-6*(9-X)^-1 = x^1
x = -6*(9-X)^-1
x = -6*(9-X)^-1
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