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r in (-oo:+oo)
10 = (5*r)/(-8) // - (5*r)/(-8)
10-((5*r)/(-8)) = 0
(5/8)*r+10 = 0
5/8*r+10 = 0 // - 10
5/8*r = -10 // : 5/8
r = -10/5/8
r = -16
r = -16
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