(2x)^2=4/9

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Solution for (2x)^2=4/9 equation: 


x in (-oo:+oo)

(2*x)^2 = 4/9 // - 4/9

(2*x)^2-(4/9) = 0

(2*x)^2-4/9 = 0

4*x^2 = 4/9 // : 4

x^2 = 1/9

x^2 = 1/9 // ^ 1/2

abs(x) = 1/3

x = 1/3 or x = -1/3

x in { 1/3, -1/3 }

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