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w in (-oo:+oo)
40 = (5/2)*w // - (5/2)*w
40-((5/2)*w) = 0
(-5/2)*w+40 = 0
40-5/2*w = 0 // - 40
-5/2*w = -40 // : -5/2
w = -40/(-5/2)
w = 16
w = 16
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