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w in (-oo:+oo)
(1/2)*w-(7*w)+9 = 94/9 // - 94/9
(1/2)*w-(7*w)-(94/9)+9 = 0
(1/2)*w-7*w-94/9+9 = 0
-13/2*w-13/9 = 0 // + 13/9
-13/2*w = 13/9 // : -13/2
w = 13/9/(-13/2)
w = -2/9
w = -2/9
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