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D( y )
2*y^2-18 = 0
2*y^2-18 = 0
2*y^2-18 = 0
2*y^2 = 18 // : 2
y^2 = 9
y^2 = 9 // ^ 1/2
abs(y) = 3
y = 3 or y = -3
y in (-oo:-3) U (-3:3) U (3:+oo)
(y^2+y-12)/(2*y^2-18) = 0
y^2+y-12 = 0
y^2+y-12 = 0
DELTA = 1^2-(-12*1*4)
DELTA = 49
DELTA > 0
y = (49^(1/2)-1)/(1*2) or y = (-49^(1/2)-1)/(1*2)
y = 3 or y = -4
(y+4)*(y-3) = 0
((y+4)*(y-3))/(2*y^2-18) = 0
( y+4 )
y+4 = 0 // - 4
y = -4
( y-3 )
y-3 = 0 // + 3
y = 3
y in { 3}
y = -4
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