r^2=4/9

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Solution for r^2=4/9 equation: 


r in (-oo:+oo)

r^2 = 4/9 // - 4/9

r^2-(4/9) = 0

r^2-4/9 = 0

1*r^2 = 4/9 // : 1

r^2 = 4/9

r^2 = 4/9 // ^ 1/2

abs(r) = 2/3

r = 2/3 or r = -2/3

r in { 2/3, -2/3 }

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