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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(45-x)/x = 23 // - 23
(45-x)/x-23 = 0
(45-x)/x+(-23*x)/x = 0
45-x-23*x = 0
45-24*x = 0
(45-24*x)/x = 0
(45-24*x)/x = 0 // * x
45-24*x = 0
45-24*x = 0 // - 45
-24*x = -45 // : -24
x = -45/(-24)
x = 15/8
x = 15/8
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