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w in (-oo:+oo)
(1/6)*w-6 = 7*w-88 // - 7*w-88
(1/6)*w-(7*w)-6+88 = 0
(1/6)*w-7*w-6+88 = 0
82-41/6*w = 0 // - 82
-41/6*w = -82 // : -41/6
w = -82/(-41/6)
w = 12
w = 12
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