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w in (-oo:+oo)
8-(6*w)-w = 85 // - 85
8-(6*w)-w-85 = 0
8-6*w-w-85 = 0
-7*w-77 = 0 // + 77
-7*w = 77 // : -7
w = 77/(-7)
w = -11
w = -11
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