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w in (-oo:+oo)
(19/2)*w < 13/5 // - 13/5
(19/2)*w-(13/5) < 0
(19/2)*w-13/5 < 0
19/2*w-13/5 < 0 // + 13/5
19/2*w < 13/5 // : 19/2
w < 13/5/19/2
w < 26/95
w in (-oo:26/95)
(-oo:26/95)
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