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z in (-oo:+oo)
(z^2)/6-((3*z)/2)-27 = 0
(z^2)/6+(-3/2)*z-27 = 0
1/6*z^2-3/2*z-27 = 0
DELTA = (-3/2)^2-(-27*1/6*4)
DELTA = 81/4
DELTA > 0
z = ((81/4)^(1/2)+3/2)/(1/6*2) or z = (3/2-(81/4)^(1/2))/(1/6*2)
z = 18 or z = -9
z in { -9, 18 }
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