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r in (-oo:+oo)
2*r^2-((2/3)*r) = 0
2*r^2+(-2/3)*r = 0
2*r^2-2/3*r = 0
DELTA = (-2/3)^2-(0*2*4)
DELTA = 4/9
DELTA > 0
r = ((4/9)^(1/2)+2/3)/(2*2) or r = (2/3-(4/9)^(1/2))/(2*2)
r = 1/3 or r = 0
r in { 0, 1/3 }
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