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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/2 = 5/x // - 5/x
7/2-(5/x) = 0
7/2-5*x^-1 = 0
-5*x^-1 = -7/2 // : -5
x^-1 = 7/10
-1 < 0
1/(x^1) = 7/10 // * x^1
1 = 7/10*x^1 // : 7/10
10/7 = x^1
x = 10/7
x = 10/7
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