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x in (-oo:+oo)
x*(480-((3*x)/2)) = 0
x*((-3/2)*x+480) = 0
x*(480-3/2*x) = 0
( 480-3/2*x )
480-3/2*x = 0 // - 480
-3/2*x = -480 // : -3/2
x = -480/(-3/2)
x = 320
( x )
x = 0
x in { 320, 0 }
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