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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/7 = 8/x // - 8/x
12/7-(8/x) = 0
12/7-8*x^-1 = 0
-8*x^-1 = -12/7 // : -8
x^-1 = 3/14
-1 < 0
1/(x^1) = 3/14 // * x^1
1 = 3/14*x^1 // : 3/14
14/3 = x^1
x = 14/3
x = 14/3
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