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x in (-oo:+oo)
x*(8-(2*x))*((11.5-(2*x))/2) = 0
x*(8-2*x)*((11.5-2*x)/2) = 0
(x*(8-2*x)*(11.5-2*x))/2 = 0
( 11.5-2*x )
11.5-2*x = 0 // - 11.5
-2*x = -11.5 // : -2
x = -11.5/(-2)
x = 5.75
( 8-2*x )
8-2*x = 0 // - 8
-2*x = -8 // : -2
x = -8/(-2)
x = 4
( x )
x = 0
x in { 5.75, 4, 0 }
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