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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.8*x = 20/x // - 20/x
0.8*x-(20/x) = 0
0.8*x-20*x^-1 = 0
0.8*x-20*x^-1 = 0
x^-1*(0.8*x^2-20) = 0
0.8*x^2 = 20 // : 0.8
x^2 = 25
x^2 = 25 // ^ 1/2
abs(x) = 5
x = 5 or x = -5
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 5, -5 }
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