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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(30*x^2)/x-(7*x)+10 = 0
(30*x^2)/x-7*x+10 = 0
23*x+10 = 0 // - 10
23*x = -10 // : 23
x = -10/23
x = -10/23
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