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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-3)/x = 9/10 // - 9/10
(x-3)/x-(9/10) = 0
(x-3)/x-9/10 = 0
(10*(x-3))/(10*x)+(-9*x)/(10*x) = 0
10*(x-3)-9*x = 0
x-30 = 0
(x-30)/(10*x) = 0
(x-30)/(10*x) = 0 // * 10*x
x-30 = 0
x-30 = 0 // + 30
x = 30
x = 30
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