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(-2-1)*(-1-1)*(((X-3)*(x-2)*(x-1))/(-3-1)) = 0
(6*(X-3)*(x-2)*(x-1))/(-4) = 0
( x-1 )
x-1 = 0 // + 1
x = 1
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 1, 2 }
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