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x in (-oo:+oo)
(x^2)/6-((5*x)/2)-36 = 0
(x^2)/6+(-5/2)*x-36 = 0
1/6*x^2-5/2*x-36 = 0
DELTA = (-5/2)^2-(-36*1/6*4)
DELTA = 121/4
DELTA > 0
x = ((121/4)^(1/2)+5/2)/(1/6*2) or x = (5/2-(121/4)^(1/2))/(1/6*2)
x = 24 or x = -9
x in { -9, 24 }
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