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