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a in (-oo:+oo)
a/4 > 4 // - 4
a/4-4 > 0
1/4*a-4 > 0 // + 4
1/4*a > 4 // : 1/4
a > 4/1/4
a > 16
a in (16:+oo)
(16:+oo)
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