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D( x )
2*x^2 = 0
2*x^2 = 0
2*x^2 = 0
2*x^2 = 0 // : 2
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(10*x^4-(6*x^3))/(2*x^2) = 0
(10*x^4-6*x^3)/(2*x^2) = 0
10*x^4-6*x^3 = 0
2*x^3*(5*x-3) = 0
5*x-3 = 0 // + 3
5*x = 3 // : 5
x = 3/5
2*x^3*(x-3/5) = 0
(2*x^3*(x-3/5))/(2*x^2) = 0
( 2*x^3 )
2*x^3 = 0 // : 2
x^3 = 0
x = 0
( x-3/5 )
x-3/5 = 0 // + 3/5
x = 3/5
x in { 0}
x = 3/5
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