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w in (-oo:+oo)
2*w-(6*w)-4 = 20 // - 20
2*w-(6*w)-20-4 = 0
2*w-6*w-20-4 = 0
-4*w-24 = 0 // + 24
-4*w = 24 // : -4
w = 24/(-4)
w = -6
w = -6
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