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x in (-oo:+oo)
x*((18-(8*x))/4) = 0
x*((18-8*x)/4) = 0
(x*(18-8*x))/4 = 0
( 18-8*x )
18-8*x = 0 // - 18
-8*x = -18 // : -8
x = -18/(-8)
x = 9/4
( x )
x = 0
x in { 9/4, 0 }
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