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r in (-oo:+oo)
2*r+6/4 = 5*r-(5/5) // - 5*r-(5/5)
2*r-(5*r)+6/4+5/5 = 0
2*r-5*r+6/4+5/5 = 0
5/2-3*r = 0 // - 5/2
-3*r = -5/2 // : -3
r = -5/2/(-3)
r = 5/6
r = 5/6
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