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r in (-oo:+oo)
3/5-r^2 = 0
-1*r^2 = -3/5 // : -1
r^2 = 3/5
r^2 = 3/5 // ^ 1/2
abs(r) = (3/5)^(1/2)
r = (3/5)^(1/2) or r = -(3/5)^(1/2)
r in { (3/5)^(1/2), -(3/5)^(1/2) }
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