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-((4/3)*x^2)-4*x-(4*x)-15 = 0
(-4/3)*x^2-4*x-4*x-15 = 0
-4/3*x^2-8*x-15 = 0
DELTA = (-8)^2-(-15*(-4/3)*4)
DELTA = -16
DELTA < 0
x belongs to the empty set
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