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w in (-oo:+oo)
7/9-6*w = 25/9 // - 25/9
7/9-6*w-(25/9) = 0
7/9-6*w-25/9 = 0
-6*w-2 = 0 // + 2
-6*w = 2 // : -6
w = 2/(-6)
w = -1/3
w = -1/3
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