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x in (-oo:+oo)
x-((4/3)*x^2)-75 = 0
(-4/3)*x^2+x-75 = 0
x-4/3*x^2-75 = 0
DELTA = 1^2-(-75*(-4/3)*4)
DELTA = -399
DELTA < 0
x belongs to the empty set
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