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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/17 = u/x // - u/x
5/17-(u/x) = 0
-u*x^-1 = -5/17 // : -u
x^-1 = 5/17/u
-1 < 0
1/(x^1) = 5/17/u // * x^1
1 = (5/17/u)*x^1 // : 5/17/u
17/5*u = x^1
x = 17/5*u
x = 17/5*u
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