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w in (-oo:+oo)
30 = (5/2)*w // - (5/2)*w
30-((5/2)*w) = 0
(-5/2)*w+30 = 0
30-5/2*w = 0 // - 30
-5/2*w = -30 // : -5/2
w = -30/(-5/2)
w = 12
w = 12
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