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