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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 7/10 // - 7/10
4/x-(7/10) = 0
4/x-7/10 = 0
4*x^-1 = 7/10 // : 4
x^-1 = 7/40
-1 < 0
1/(x^1) = 7/40 // * x^1
1 = 7/40*x^1 // : 7/40
40/7 = x^1
x = 40/7
x = 40/7
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