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