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w in (-oo:+oo)
31 < w/0.7 // - w/0.7
31-(w/0.7) < 0
31-1.42857143*w < 0
31-1.42857143*w < 0 // - 31
-1.42857143*w < -31 // : -1.42857143
w > -31/(-1.42857143)
w > 21.69999998
w in (21.69999998:+oo)
(21.69999998:+oo)
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