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r in (-oo:+oo)
r/15 > -3 // + 3
r/15+3 > 0
1/15*r+3 > 0 // - 3
1/15*r > -3 // : 1/15
r > -3/1/15
r > -45
r in (-45:+oo)
(-45:+oo)
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