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D( x )
x-10 = 0
x-10 = 0
x-10 = 0
x-10 = 0 // + 10
x = 10
x in (-oo:10) U (10:+oo)
(15*x-50)/(x-10) = 0
15*x-50 = 0 // + 50
15*x = 50 // : 15
x = 50/15
x = 10/3
x = 10/3
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