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w in (-oo:+oo)
50 = (5/2)*w // - (5/2)*w
50-((5/2)*w) = 0
(-5/2)*w+50 = 0
50-5/2*w = 0 // - 50
-5/2*w = -50 // : -5/2
w = -50/(-5/2)
w = 20
w = 20
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