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w in (-oo:+oo)
10-(2*w) = 4*w-8 // - 4*w-8
8-(2*w)-(4*w)+10 = 0
8-2*w-4*w+10 = 0
18-6*w = 0 // - 18
-6*w = -18 // : -6
w = -18/(-6)
w = 3
w = 3
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