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w in (-oo:+oo)
30 = (3/6)*w // - (3/6)*w
30-((3/6)*w) = 0
(-1/2)*w+30 = 0
30-1/2*w = 0 // - 30
-1/2*w = -30 // : -1/2
w = -30/(-1/2)
w = 60
w = 60
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