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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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