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x in (-oo:+oo)
(x/2)*(437.5-(17.5*x)) = 0
(x/2)*(437.5-17.5*x) = 0
1/2*x*(437.5-17.5*x) = 0
( 1/2*x )
1/2*x = 0 // : 1/2
x = 0
( 437.5-17.5*x )
437.5-17.5*x = 0 // - 437.5
-17.5*x = -437.5 // : -17.5
x = -437.5/(-17.5)
x = 25
x in { 0, 25 }
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