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w in (-oo:+oo)
(-4/5)*w+8/9 = 5/9 // - 5/9
(-4/5)*w+8/9-(5/9) = 0
(-4/5)*w+8/9-5/9 = 0
1/3-4/5*w = 0 // - 1/3
-4/5*w = -1/3 // : -4/5
w = -1/3/(-4/5)
w = 5/12
w = 5/12
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