d2=4/9

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Solution for d2=4/9 equation: 


d in (-oo:+oo)

d^2 = 4/9 // - 4/9

d^2-(4/9) = 0

d^2-4/9 = 0

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

d^2 = 4/9

d^2 = 4/9 // ^ 1/2

abs(d) = 2/3

d = 2/3 or d = -2/3

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

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