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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.2*y = 4/x-2 // - 4/x-2
0.2*y-(4/x)+2 = 0
0.2*y-4*x^-1+2 = 0
-4*x^-1 = -(0.2*y+2) // : -4
x^-1 = (0.2*y+2)/4
-1 < 0
1/(x^1) = (0.2*y+2)/4 // * x^1
1 = x^1*((0.2*y+2)/4) // : (0.2*y+2)/4
4*(0.2*y+2)^-1 = x^1
x = 4*(0.2*y+2)^-1
x = 4*(0.2*y+2)^-1
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