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w in (-oo:+oo)
-((4/5)*w)-2/3 = -1/2 // + -1/2
-((4/5)*w)-2/3-(-1/2) = 0
(-4/5)*w-2/3+1/2 = 0
-4/5*w-1/6 = 0 // + 1/6
-4/5*w = 1/6 // : -4/5
w = 1/6/(-4/5)
w = -5/24
w = -5/24
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