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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2.5-x)/x = 0.3 // - 0.3
(2.5-x)/x-0.3 = 0
(2.5-x)/x+(-0.3*x)/x = 0
2.5-x-0.3*x = 0
2.5-1.3*x = 0
(2.5-1.3*x)/x = 0
(2.5-1.3*x)/x = 0 // * x
2.5-1.3*x = 0
2.5-1.3*x = 0 // - 2.5
-1.3*x = -2.5 // : -1.3
x = -2.5/(-1.3)
x = 1.92307692
x = 1.92307692
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