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w in (-oo:+oo)
1/2-((4/3)*w) = -4/5 // + -4/5
1/2-((4/3)*w)-(-4/5) = 0
(-4/3)*w+1/2+4/5 = 0
13/10-4/3*w = 0 // - 13/10
-4/3*w = -13/10 // : -4/3
w = -13/10/(-4/3)
w = 39/40
w = 39/40
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