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r in (-oo:+oo)
(-5/8)*r = 45/16 // - 45/16
(-5/8)*r-(45/16) = 0
(-5/8)*r-45/16 = 0
-5/8*r-45/16 = 0 // + 45/16
-5/8*r = 45/16 // : -5/8
r = 45/16/(-5/8)
r = -9/2
r = -9/2
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