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w in (-oo:+oo)
(3/4)*w > 12 // - 12
(3/4)*w-12 > 0
3/4*w-12 > 0 // + 12
3/4*w > 12 // : 3/4
w > 12/3/4
w > 16
w in (16:+oo)
(16:+oo)
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