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w in (-oo:+oo)
30 = (5/3)*w // - (5/3)*w
30-((5/3)*w) = 0
(-5/3)*w+30 = 0
30-5/3*w = 0 // - 30
-5/3*w = -30 // : -5/3
w = -30/(-5/3)
w = 18
w = 18
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