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y in (-oo:+oo)
(1/4)*y^2+14*y-(2*y)-4 = 0
(1/4)*y^2+14*y-2*y-4 = 0
1/4*y^2+12*y-4 = 0
DELTA = 12^2-(-4*1/4*4)
DELTA = 148
DELTA > 0
y = (148^(1/2)-12)/(1/4*2) or y = (-148^(1/2)-12)/(1/4*2)
y = 2*(2*37^(1/2)-12) or y = 2*(-2*37^(1/2)-12)
y in { 2*(-2*37^(1/2)-12), 2*(2*37^(1/2)-12) }
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