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w in (-oo:+oo)
(1/4)*w < 16 // - 16
(1/4)*w-16 < 0
1/4*w-16 < 0 // + 16
1/4*w < 16 // : 1/4
w < 16/1/4
w < 64
w in (-oo:64)
(-oo:64)
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