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