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r in (-oo:+oo)
(39*r)/5+13/2 = -(r/5-(3/2)) // + r/5-(3/2)
(39*r)/5+r/5+13/2-(3/2) = 0
(39*r)/5+r/5+13/2-3/2 = 0
8*r+5 = 0 // - 5
8*r = -5 // : 8
r = -5/8
r = -5/8
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