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f in (-oo:+oo)
3*f-(10/5) > 7 // - 7
3*f-(10/5)-7 > 0
3*f-7-2 > 0
3*f-9 > 0 // + 9
3*f > 9 // : 3
f > 9/3
f > 3
f in (3:+oo)
(3:+oo)
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