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D( x )
x^1 = 0
x^1 = 0
x^1 = 0
x = 0
x in (-oo:0) U (0:+oo)
Y = (590/(x^1))/2 // - (590/(x^1))/2
Y-((590/(x^1))/2) = 0
Y-295*x^-1 = 0
-295*x^-1 = -Y // : -295
x^-1 = Y/295
-1 < 0
1/(x^1) = Y/295 // * x^1
1 = (Y/295)*x^1 // : Y/295
295*Y^-1 = x^1
x = 295*Y^-1
x = 295*Y^-1
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