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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/10 = 2/x // - 2/x
7/10-(2/x) = 0
7/10-2*x^-1 = 0
-2*x^-1 = -7/10 // : -2
x^-1 = 7/20
-1 < 0
1/(x^1) = 7/20 // * x^1
1 = 7/20*x^1 // : 7/20
20/7 = x^1
x = 20/7
x = 20/7
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