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w in (-oo:+oo)
(1/3)*w-1/2 = (4/5)*w+83/30 // - (4/5)*w+83/30
(1/3)*w-((4/5)*w)-1/2-(83/30) = 0
(1/3)*w+(-4/5)*w-1/2-83/30 = 0
-7/15*w-49/15 = 0 // + 49/15
-7/15*w = 49/15 // : -7/15
w = 49/15/(-7/15)
w = -7
w = -7
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