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w in (-oo:+oo)
6-((2/5)*w) = 46/5 // - 46/5
6-((2/5)*w)-(46/5) = 0
(-2/5)*w-46/5+6 = 0
-2/5*w-16/5 = 0 // + 16/5
-2/5*w = 16/5 // : -2/5
w = 16/5/(-2/5)
w = -8
w = -8
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