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x in (-oo:+oo)
x-((3/3)*x^2)-(5*x)-36 = 0
x-x^2-5*x-36 = 0
-x^2-4*x-36 = 0
DELTA = (-4)^2-(-36*(-1)*4)
DELTA = -128
DELTA < 0
x belongs to the empty set
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