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w in (-oo:+oo)
-5/3 = (-1/2)*w-(4/5) // - (-1/2)*w-(4/5)
4/5-((-1/2)*w)-5/3 = 0
(1/2)*w-5/3+4/5 = 0
1/2*w-13/15 = 0 // + 13/15
1/2*w = 13/15 // : 1/2
w = 13/15/1/2
w = 26/15
w = 26/15
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