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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)
(((x+3)*(x-1))/(x-10))*(x+3) = 0
((x+3)^2*(x-1))/(x-10) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -3, -3, 1 }
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