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w in (-oo:+oo)
8-4*w = 4*w+104 // - 4*w+104
8-4*w-(4*w)-104 = 0
8-4*w-4*w-104 = 0
-8*w-96 = 0 // + 96
-8*w = 96 // : -8
w = 96/(-8)
w = -12
w = -12
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