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r in (-oo:+oo)
-r/15 = 8/5 // - 8/5
-r/15-(8/5) = 0
-r/15-8/5 = 0
-1/15*r-8/5 = 0 // + 8/5
-1/15*r = 8/5 // : -1/15
r = 8/5/(-1/15)
r = -24
r = -24
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