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r in (-oo:+oo)
9*r-(18/2) < 45 // - 45
9*r-(18/2)-45 < 0
9*r-45-9 < 0
9*r-54 < 0 // + 54
9*r < 54 // : 9
r < 54/9
r < 6
r in (-oo:6)
(-oo:6)
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