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w in (-oo:+oo)
(1/3)*w-(7*w)-6 = -11/6 // + -11/6
(1/3)*w-(7*w)-(-11/6)-6 = 0
(1/3)*w-7*w+11/6-6 = 0
-20/3*w-25/6 = 0 // + 25/6
-20/3*w = 25/6 // : -20/3
w = 25/6/(-20/3)
w = -5/8
w = -5/8
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