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w in (-oo:+oo)
4-(3*w)-(2*w) = -16 // + 16
4-(3*w)-(2*w)+16 = 0
4-3*w-2*w+16 = 0
20-5*w = 0 // - 20
-5*w = -20 // : -5
w = -20/(-5)
w = 4
w = 4
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