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r in (-oo:+oo)
-64 = (8/5)*r // - (8/5)*r
-((8/5)*r)-64 = 0
(-8/5)*r-64 = 0
-8/5*r-64 = 0 // + 64
-8/5*r = 64 // : -8/5
r = 64/(-8/5)
r = -40
r = -40
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