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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-3 = -2/5 // + -2/5
4/x-(-2/5)-3 = 0
4/x+2/5-3 = 0
4*x^-1 = 13/5 // : 4
x^-1 = 13/20
-1 < 0
1/(x^1) = 13/20 // * x^1
1 = 13/20*x^1 // : 13/20
20/13 = x^1
x = 20/13
x = 20/13
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