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z in (-oo:+oo)
((6*z)/3)*z = 27 // - 27
((6*z)/3)*z-27 = 0
2*z^2 = 27 // : 2
z^2 = 27/2
z^2 = 27/2 // ^ 1/2
abs(z) = (27/2)^(1/2)
z = (27/2)^(1/2) or z = -(27/2)^(1/2)
z in { (27/2)^(1/2), -(27/2)^(1/2) }
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