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D( x )
3*x = 0
x = 0
10/(3*x) = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x = 0
x = 0
10/(3*x) = 0
10/(3*x) = 0
10/3*x^-1 = 0 // : 10/3
x^-1 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
((30*x+15)/x)/(10/(3*x)) = 0
(30*x+15)/(10/3*x^-1*x) = 0
30*x+15 = 0 // - 15
30*x = -15 // : 30
x = -15/30
x = -1/2
x = -1/2
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