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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x = 75/x // - 75/x
3*x-(75/x) = 0
3*x-75*x^-1 = 0
3*x^1-75*x^-1 = 0
(3*x^2-75*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2-75*x^0) = 0
x^1
3*x^2-75 = 0
3*x^2-75 = 0
DELTA = 0^2-(-75*3*4)
DELTA = 900
DELTA > 0
x = (900^(1/2)+0)/(2*3) or x = (0-900^(1/2))/(2*3)
x = 5 or x = -5
x in { -5, 5}
x in { -5, 5 }
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