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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y/7 = 2/x // - 2/x
y/7-(2/x) = 0
y/7-2*x^-1 = 0
-2*x^-1 = -(1/7*y) // : -2
x^-1 = 1/14*y
-1 < 0
1/(x^1) = 1/14*y // * x^1
1 = 1/14*x^1*y // : 1/14*y
14*y^-1 = x^1
x = 14*y^-1
x = 14*y^-1
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