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w in (-oo:+oo)
(-8/7)*w = 4 // - 4
(-8/7)*w-4 = 0
-8/7*w-4 = 0 // + 4
-8/7*w = 4 // : -8/7
w = 4/(-8/7)
w = -7/2
w = -7/2
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