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x*((4*x-12)/12) = 0
(x*(4*x-12))/12 = 0
( 4*x-12 )
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
( x )
x = 0
x in { 3, 0 }
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