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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7 = 0.2/x // - 0.2/x
7-(0.2/x) = 0
7-0.2*x^-1 = 0
-0.2*x^-1 = -7 // : -0.2
x^-1 = 35
-1 < 0
1/(x^1) = 35 // * x^1
1 = 35*x^1 // : 35
1/35 = x^1
x = 1/35
x = 1/35
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