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w in (-oo:+oo)
(-1/8)*w = -3/7 // + -3/7
(-1/8)*w-(-3/7) = 0
(-1/8)*w+3/7 = 0
3/7-1/8*w = 0 // - 3/7
-1/8*w = -3/7 // : -1/8
w = -3/7/(-1/8)
w = 24/7
w = 24/7
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