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w in (-oo:+oo)
(-4/5)*w+(1/3)*w+1/4+1/5 = 0
9/20-7/15*w = 0 // - 9/20
-7/15*w = -9/20 // : -7/15
w = -9/20/(-7/15)
w = 27/28
w = 27/28
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