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R in (-oo:+oo)
R/7 > 9 // - 9
R/7-9 > 0
1/7*R-9 > 0 // + 9
1/7*R > 9 // : 1/7
R > 9/1/7
R > 63
R in (63:+oo)
(63:+oo)
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