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r in (-oo:+oo)
r/7-11 < 3 // - 3
r/7-11-3 < 0
1/7*r-14 < 0 // + 14
1/7*r < 14 // : 1/7
r < 14/1/7
r < 98
r in (-oo:98)
(-oo:98)
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