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x*((400-(2*x))/2) = 0
x*((400-2*x)/2) = 0
(x*(400-2*x))/2 = 0
( 400-2*x )
400-2*x = 0 // - 400
-2*x = -400 // : -2
x = -400/(-2)
x = 200
( x )
x = 0
x in { 200, 0 }
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