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(4-x)^2*(x-(9/2)) = 0
(4-x)^2*(x-9/2) = 0
( 4-x )
4-x = 0 // - 4
-x = -4 // * -1
x = 4
( x-9/2 )
x-9/2 = 0 // + 9/2
x = 9/2
x in { 4, 4, 9/2 }
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