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