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y in (-oo:+oo)
(3*y)/4-3 = y^2+3 // - y^2+3
(3*y)/4-y^2-3-3 = 0
3/4*y-y^2-6 = 0
DELTA = (3/4)^2-(-6*(-1)*4)
DELTA = -375/16
DELTA < 0
y belongs to the empty set
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