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D( x )
-3*x = 0
-3*x = 0
-3*x = 0
-3*x = 0 // : -3
x = 0
x in (-oo:0) U (0:+oo)
3/(-3*x) = (-6*x)/4 // - (-6*x)/4
3/(-3*x)-((-6*x)/4) = 0
(3/2)*x+3/(-3*x) = 0
3/2*x^1-1*x^-1 = 0
(3/2*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(3/2*x^2-1*x^0) = 0
x^1
(3/2)*x^2-1 = 0
(3/2)*x^2-1 = 0
DELTA = 0^2-(-1*4*(3/2))
DELTA = 6
DELTA > 0
x = (6^(1/2)+0)/(2*(3/2)) or x = (0-6^(1/2))/(2*(3/2))
x = (6^(1/2))/3 or x = (-6^(1/2))/3
x in { (-6^(1/2))/3, (6^(1/2))/3}
x in { (-6^(1/2))/3, (6^(1/2))/3 }
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