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(x-(2/10))*(x-(3/8)) = 0
(x-1/5)*(x-3/8) = 0
( x-1/5 )
x-1/5 = 0 // + 1/5
x = 1/5
( x-3/8 )
x-3/8 = 0 // + 3/8
x = 3/8
x in { 1/5, 3/8 }
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