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