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