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w in (-oo:+oo)
(-7/4)*w = -1 // + 1
(-7/4)*w+1 = 0
1-7/4*w = 0 // - 1
-7/4*w = -1 // : -7/4
w = -1/(-7/4)
w = 4/7
w = 4/7
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