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w in (-oo:+oo)
7/2 = 56*w // - 56*w
7/2-(56*w) = 0
7/2-56*w = 0
7/2-56*w = 0 // - 7/2
-56*w = -7/2 // : -56
w = -7/2/(-56)
w = 1/16
w = 1/16
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