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W in (-oo:+oo)
W/2-5 > 45 // - 45
W/2-45-5 > 0
1/2*W-50 > 0 // + 50
1/2*W > 50 // : 1/2
W > 50/1/2
W > 100
W in (100:+oo)
(100:+oo)
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