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w in (-oo:+oo)
28 = 6*w-2*w+8 // - 6*w-2*w+8
28-(-2*w)-(6*w)-8 = 0
2*w-6*w-8+28 = 0
20-4*w = 0 // - 20
-4*w = -20 // : -4
w = -20/(-4)
w = 5
w = 5
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