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y in (-oo:+oo)
3*y^2-((15/3)*y^2)+4*y-(2*y)-5 = 0
3*y^2-5*y^2+4*y-2*y-5 = 0
2*y-2*y^2-5 = 0
DELTA = 2^2-(-5*(-2)*4)
DELTA = -36
DELTA < 0
y belongs to the empty set
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