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z in (-oo:+oo)
(z/2)*z-((2*6)/7) = 0
(z/2)*z-12/7 = 0
1/2*z^2 = 12/7 // : 1/2
z^2 = 24/7
z^2 = 24/7 // ^ 1/2
abs(z) = (24/7)^(1/2)
z = (24/7)^(1/2) or z = -(24/7)^(1/2)
z in { (24/7)^(1/2), -(24/7)^(1/2) }
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