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(1/3)*x^2+0*x-27 = 0
(1/3)*x^2-27 = 0
1/3*x^2 = 27 // : 1/3
x^2 = 81
x^2 = 81 // ^ 1/2
abs(x) = 9
x = 9 or x = -9
x in { 9, -9 }
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