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r in (-oo:+oo)
r/3 > -5 // + 5
r/3+5 > 0
1/3*r+5 > 0 // - 5
1/3*r > -5 // : 1/3
r > -5/1/3
r > -15
r in (-15:+oo)
(-15:+oo)
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