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x*((10*x-9)/3) = 0
(x*(10*x-9))/3 = 0
( 10*x-9 )
10*x-9 = 0 // + 9
10*x = 9 // : 10
x = 9/10
( x )
x = 0
x in { 9/10, 0 }
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