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w in (-oo:+oo)
56 = (2/7)*w // - (2/7)*w
56-((2/7)*w) = 0
(-2/7)*w+56 = 0
56-2/7*w = 0 // - 56
-2/7*w = -56 // : -2/7
w = -56/(-2/7)
w = 196
w = 196
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