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w in (-oo:+oo)
-6 = w/8-4 // - w/8-4
4-(w/8)-6 = 0
-1/8*w-2 = 0 // + 2
-1/8*w = 2 // : -1/8
w = 2/(-1/8)
w = -16
w = -16
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