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w in (-oo:+oo)
-9/10 = (14/15)*w // - (14/15)*w
-((14/15)*w)-9/10 = 0
(-14/15)*w-9/10 = 0
-14/15*w-9/10 = 0 // + 9/10
-14/15*w = 9/10 // : -14/15
w = 9/10/(-14/15)
w = -27/28
w = -27/28
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