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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.1*x+40/x+2 = 0.2*x+2 // - 0.2*x+2
0.1*x-(0.2*x)+40/x-2+2 = 0
0.1*x-0.2*x+40/x-2+2 = 0
40*x^-1-0.1*x = 0
x^-1*(40-0.1*x^2) = 0
-0.1*x^2 = -40 // : -0.1
x^2 = 400
x^2 = 400 // ^ 1/2
abs(x) = 20
x = 20 or x = -20
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x in { 20, -20 }
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