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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/12 = 7/x // - 7/x
11/12-(7/x) = 0
11/12-7*x^-1 = 0
-7*x^-1 = -11/12 // : -7
x^-1 = 11/84
-1 < 0
1/(x^1) = 11/84 // * x^1
1 = 11/84*x^1 // : 11/84
84/11 = x^1
x = 84/11
x = 84/11
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