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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
x/(x-5) = x/3 // - x/3
x/(x-5)-(x/3) = 0
x/(x-5)-x/3 = 0
(3*x)/(3*(x-5))+(-x*(x-5))/(3*(x-5)) = 0
3*x-x*(x-5) = 0
8*x-x^2 = 0
8*x-x^2 = 0
x*(8-x) = 0
8-x = 0 // - 8
-x = -8 // * -1
x = 8
x*(x-8) = 0
(x*(x-8))/(3*(x-5)) = 0
(x*(x-8))/(3*(x-5)) = 0 // * 3*(x-5)
x*(x-8) = 0
( x-8 )
x-8 = 0 // + 8
x = 8
( x )
x = 0
x in { 8, 0 }
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