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r in (-oo:+oo)
-r/4 < 8 // - 8
-r/4-8 < 0
-1/4*r-8 < 0 // + 8
-1/4*r < 8 // : -1/4
r > 8/(-1/4)
r > -32
r in (-32:+oo)
(-32:+oo)
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