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x in (-oo:+oo)
(3/4)*(4*x-4)-(3*x+9)^2 = 0
3/4*(4*x-4)-1*(3*x+9)^2 = 0
3/4*(4*x-4)-1*(3*x+9)^2 = 0
-9*x^2-51*x-84 = 0
-9*x^2-51*x-84 = 0
-3*(3*x^2+17*x+28) = 0
3*x^2+17*x+28 = 0
DELTA = 17^2-(3*4*28)
DELTA = -47
DELTA < 0
-3 = 0
-3 = 0
x belongs to the empty set
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