1/3x^2-21=27

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Solution for 1/3x^2-21=27 equation: 


x in (-oo:+oo)

(1/3)*x^2-21 = 27 // - 27

(1/3)*x^2-27-21 = 0

1/3*x^2 = 48 // : 1/3

x^2 = 144

x^2 = 144 // ^ 1/2

abs(x) = 12

x = 12 or x = -12

x in { 12, -12 }

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