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((4*(2*x-1))/5)*(x-3) = 0
(4*(2*x-1)*(x-3))/5 = 0
( 2*x-1 )
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 1/2, 3 }
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