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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x-5)/x-3 = 0
(2*x-5)/x+(-3*x)/x = 0
2*x-3*x-5 = 0
-x-5 = 0
(-x-5)/x = 0
(-x-5)/x = 0 // * x
-x-5 = 0
-x-5 = 0 // + 5
-x = 5 // * -1
x = -5
x = -5
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