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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-((6/4)*x) = 0
(-3/2)*x+10/x = 0
10*x^-1-3/2*x^1 = 0
(10*x^0-3/2*x^2)/(x^1) = 0 // * x^2
x^1*(10*x^0-3/2*x^2) = 0
x^1
(-3/2)*x^2+10 = 0
(-3/2)*x^2+10 = 0
DELTA = 0^2-(4*10*(-3/2))
DELTA = 60
DELTA > 0
x = (60^(1/2)+0)/(2*(-3/2)) or x = (0-60^(1/2))/(2*(-3/2))
x = (2*15^(1/2))/(-3) or x = (-2*15^(1/2))/(-3)
x in { (2*15^(1/2))/(-3), (-2*15^(1/2))/(-3)}
x in { (2*15^(1/2))/(-3), (-2*15^(1/2))/(-3) }
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