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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4 = 7/5-(2/x) // - 7/5-(2/x)
2/x-(7/5)+4 = 0
2/x-7/5+4 = 0
2*x^-1 = -13/5 // : 2
x^-1 = -13/10
-1 < 0
1/(x^1) = -13/10 // * x^1
1 = -13/10*x^1 // : -13/10
-10/13 = x^1
x = -10/13
x = -10/13
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