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w in (-oo:+oo)
w-((7/2)*w)-14 = 0
w+(-7/2)*w-14 = 0
-5/2*w-14 = 0 // + 14
-5/2*w = 14 // : -5/2
w = 14/(-5/2)
w = -28/5
w = -28/5
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