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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/7 = 6/x // - 6/x
5/7-(6/x) = 0
5/7-6*x^-1 = 0
-6*x^-1 = -5/7 // : -6
x^-1 = 5/42
-1 < 0
1/(x^1) = 5/42 // * x^1
1 = 5/42*x^1 // : 5/42
42/5 = x^1
x = 42/5
x = 42/5
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