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(x-4)*(x-(3/5)) = 0
(x-4)*(x-3/5) = 0
( x-3/5 )
x-3/5 = 0 // + 3/5
x = 3/5
( x-4 )
x-4 = 0 // + 4
x = 4
x in { 3/5, 4 }
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