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w in (-oo:+oo)
w/(-3)-(2/15) = 4/5 // - 4/5
w/(-3)-(2/15)-(4/5) = 0
w/(-3)-2/15-4/5 = 0
-1/3*w-14/15 = 0 // + 14/15
-1/3*w = 14/15 // : -1/3
w = 14/15/(-1/3)
w = -14/5
w = -14/5
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