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(x-4)*(x-(5/2)) = 0
(x-4)*(x-5/2) = 0
( x-4 )
x-4 = 0 // + 4
x = 4
( x-5/2 )
x-5/2 = 0 // + 5/2
x = 5/2
x in { 4, 5/2 }
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