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w in (-oo:+oo)
1/6-5*w = 91/6 // - 91/6
1/6-5*w-(91/6) = 0
1/6-5*w-91/6 = 0
-5*w-15 = 0 // + 15
-5*w = 15 // : -5
w = 15/(-5)
w = -3
w = -3
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