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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3-x)/x = 0.3 // - 0.3
(3-x)/x-0.3 = 0
(3-x)/x+(-0.3*x)/x = 0
3-x-0.3*x = 0
3-1.3*x = 0
(3-1.3*x)/x = 0
(3-1.3*x)/x = 0 // * x
3-1.3*x = 0
3-1.3*x = 0 // - 3
-1.3*x = -3 // : -1.3
x = -3/(-1.3)
x = 2.30769231
x = 2.30769231
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