4/9x^2-16

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Solution for 4/9x^2-16 equation: 


x in (-oo:+oo)

(4/9)*x^2-16 = 0

4/9*x^2 = 16 // : 4/9

x^2 = 36

x^2 = 36 // ^ 1/2

abs(x) = 6

x = 6 or x = -6

x in { 6, -6 }

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