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w in (-oo:+oo)
(2/3)*w-3 < 7 // - 7
(2/3)*w-7-3 < 0
2/3*w-10 < 0 // + 10
2/3*w < 10 // : 2/3
w < 10/2/3
w < 15
w in (-oo:15)
(-oo:15)
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