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f in (-oo:+oo)
f/(-22) < 48 // - 48
f/(-22)-48 < 0
-1/22*f-48 < 0 // + 48
-1/22*f < 48 // : -1/22
f > 48/(-1/22)
f > -1056
f in (-1056:+oo)
(-1056:+oo)
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