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w in (-oo:+oo)
7/40 = w/2 // - w/2
7/40-(w/2) = 0
7/40-1/2*w = 0 // - 7/40
-1/2*w = -7/40 // : -1/2
w = -7/40/(-1/2)
w = 7/20
w = 7/20
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