1/3*t^2-9=0

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Solution for 1/3*t^2-9=0 equation: 


t in (-oo:+oo)

(1/3)*t^2-9 = 0

1/3*t^2 = 9 // : 1/3

t^2 = 27

t^2 = 27 // ^ 1/2

abs(t) = 3*3^(1/2)

t = 3*3^(1/2) or t = -(3*3^(1/2))

t in { 3*3^(1/2), -(3*3^(1/2)) }

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