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w in (-oo:+oo)
(2/3)*w < 7 // - 7
(2/3)*w-7 < 0
2/3*w-7 < 0 // + 7
2/3*w < 7 // : 2/3
w < 7/2/3
w < 21/2
w in (-oo:21/2)
(-oo:21/2)
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