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D( x )
x = 0
5-(5*x) = 0
x = 0
x = 0
5-(5*x) = 0
5-(5*x) = 0
5-5*x = 0
5-5*x = 0 // - 5
-5*x = -5 // : -5
x = -5/(-5)
x = 1
x in (-oo:0) U (0:1) U (1:+oo)
((x^2-x)/x)*((5*x-15)/(5-(5*x))) = 0
((x^2-x)/x)*((5*x-15)/(5-5*x)) = 0
((x^2-x)*(5*x-15))/(x*(5-5*x)) = 0
x^2-x = 0
x*(x-1) = 0
x-1 = 0 // + 1
x = 1
x*(x-1) = 0
((x-1)*(5*x-15))/(5-5*x) = 0
( 5*x-15 )
5*x-15 = 0 // + 15
5*x = 15 // : 5
x = 15/5
x = 3
( x-1 )
x-1 = 0 // + 1
x = 1
x in { 1}
x = 3
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