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(2*x-(4/5))*(x-1) = 0
(2*x-4/5)*(x-1) = 0
( 2*x-4/5 )
2*x-4/5 = 0 // + 4/5
2*x = 4/5 // : 2
x = 4/5/2
x = 2/5
( x-1 )
x-1 = 0 // + 1
x = 1
x in { 2/5, 1 }
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