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r in (-oo:+oo)
13/15 = (8/3)*r+1/5+2 // - (8/3)*r+1/5+2
13/15-((8/3)*r)-(1/5)-2 = 0
(-8/3)*r+13/15-1/5-2 = 0
-8/3*r-4/3 = 0 // + 4/3
-8/3*r = 4/3 // : -8/3
r = 4/3/(-8/3)
r = -1/2
r = -1/2
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