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