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x in (-oo:+oo)
x^2+(10*x)/6 = -4 // + 4
x^2+(10*x)/6+4 = 0
x^2+5/3*x+4 = 0
DELTA = (5/3)^2-(1*4*4)
DELTA = -119/9
DELTA < 0
x belongs to the empty set
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