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w in (-oo:+oo)
5/7-6*w = -16/7 // + -16/7
5/7-6*w-(-16/7) = 0
5/7-6*w+16/7 = 0
3-6*w = 0 // - 3
-6*w = -3 // : -6
w = -3/(-6)
w = 1/2
w = 1/2
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