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w in (-oo:+oo)
7-((1/3)*w) = 78/11 // - 78/11
7-((1/3)*w)-(78/11) = 0
(-1/3)*w-78/11+7 = 0
-1/3*w-1/11 = 0 // + 1/11
-1/3*w = 1/11 // : -1/3
w = 1/11/(-1/3)
w = -3/11
w = -3/11
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