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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/2 = (1/7)/x // - (1/7)/x
5/2-((1/7)/x) = 0
(-1/7)*x^-1+5/2 = 0
-1/7*x^-1 = -5/2 // : -1/7
x^-1 = 35/2
-1 < 0
1/(x^1) = 35/2 // * x^1
1 = 35/2*x^1 // : 35/2
2/35 = x^1
x = 2/35
x = 2/35
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