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w in (-oo:+oo)
4-(7*w)-w = 84 // - 84
4-(7*w)-w-84 = 0
4-7*w-w-84 = 0
-8*w-80 = 0 // + 80
-8*w = 80 // : -8
w = 80/(-8)
w = -10
w = -10
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