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z in (-oo:+oo)
(z^2)/6-(7/2)-45 = 0
(z^2)/6-7/2-45 = 0
1/6*z^2 = 97/2 // : 1/6
z^2 = 291
z^2 = 291 // ^ 1/2
abs(z) = 291^(1/2)
z = 291^(1/2) or z = -291^(1/2)
z in { 291^(1/2), -291^(1/2) }
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