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D( y )
12*y-1 = 0
12*y-1 = 0
12*y-1 = 0
12*y-1 = 0 // + 1
12*y = 1 // : 12
y = 1/12
y in (-oo:1/12) U (1/12:+oo)
(48*y^2+8*y+7)/(12*y-1) = 0
48*y^2+8*y+7 = 0
48*y^2+8*y+7 = 0
DELTA = 8^2-(4*7*48)
DELTA = -1280
DELTA < 0
1 = 0
1/(12*y-1) = 0
y belongs to the empty set
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