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w in (-oo:+oo)
(-9/7)*w = -8 // + 8
(-9/7)*w+8 = 0
8-9/7*w = 0 // - 8
-9/7*w = -8 // : -9/7
w = -8/(-9/7)
w = 56/9
w = 56/9
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