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x in (-oo:+oo)
(-3/2)*x^2-(12*x)-18 = 0
(-3/2)*x^2-12*x-18 = 0
-3/2*x^2-12*x-18 = 0
DELTA = (-12)^2-(-18*(-3/2)*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)+12)/(-3/2*2) or x = (12-36^(1/2))/(-3/2*2)
x = -6 or x = -2
x in { -6, -2 }
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