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r in (-oo:+oo)
13/5 = (26*r)/5-((9*r)/5)+3/5 // - (26*r)/5-((9*r)/5)+3/5
(9*r)/5-((26*r)/5)+13/5-(3/5) = 0
(-26/5)*r+(9*r)/5+13/5-3/5 = 0
2-17/5*r = 0 // - 2
-17/5*r = -2 // : -17/5
r = -2/(-17/5)
r = 10/17
r = 10/17
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