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