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w in (-oo:+oo)
-((2/3)*w)-1/2 = 4/5 // - 4/5
-((2/3)*w)-1/2-(4/5) = 0
(-2/3)*w-1/2-4/5 = 0
-2/3*w-13/10 = 0 // + 13/10
-2/3*w = 13/10 // : -2/3
w = 13/10/(-2/3)
w = -39/20
w = -39/20
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