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w in (-oo:+oo)
30 = (6/5)*w // - (6/5)*w
30-((6/5)*w) = 0
(-6/5)*w+30 = 0
30-6/5*w = 0 // - 30
-6/5*w = -30 // : -6/5
w = -30/(-6/5)
w = 25
w = 25
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