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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/5)*x+(2*x)/x-5-2 = 0
3/5*x-5 = 0 // + 5
3/5*x = 5 // : 3/5
x = 5/3/5
x = 25/3
x = 25/3
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