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x*((4*x-32)/20) = 0
(x*(4*x-32))/20 = 0
( 4*x-32 )
4*x-32 = 0 // + 32
4*x = 32 // : 4
x = 32/4
x = 8
( x )
x = 0
x in { 8, 0 }
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