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w in (-oo:+oo)
1/2-((4/3)*w) = -1/5 // + -1/5
1/2-((4/3)*w)-(-1/5) = 0
(-4/3)*w+1/2+1/5 = 0
7/10-4/3*w = 0 // - 7/10
-4/3*w = -7/10 // : -4/3
w = -7/10/(-4/3)
w = 21/40
w = 21/40
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