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w in (-oo:+oo)
11/12 = w/15 // - w/15
11/12-(w/15) = 0
11/12-1/15*w = 0 // - 11/12
-1/15*w = -11/12 // : -1/15
w = -11/12/(-1/15)
w = 55/4
w = 55/4
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