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x in (-oo:+oo)
(2/4)*x*(x-(6/8)) = 0
(2/4)*x*(x-3/4) = 0
1/2*x*(x-3/4) = 0
( 1/2*x )
1/2*x = 0 // : 1/2
x = 0
( x-3/4 )
x-3/4 = 0 // + 3/4
x = 3/4
x in { 0, 3/4 }
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