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r in (-oo:+oo)
(5*r)/15+10/15 = (2*r)/2-(4/2) // - (2*r)/2-(4/2)
(5*r)/15-((2*r)/2)+10/15+4/2 = 0
(5*r)/15-r+10/15+4/2 = 0
8/3-2/3*r = 0 // - 8/3
-2/3*r = -8/3 // : -2/3
r = -8/3/(-2/3)
r = 4
r = 4
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