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x in (-oo:+oo)
x*((2*x-8)/4) = 0
(x*(2*x-8))/4 = 0
( 2*x-8 )
2*x-8 = 0 // + 8
2*x = 8 // : 2
x = 8/2
x = 4
( x )
x = 0
x in { 4, 0 }
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