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D( a )
3*a-2 = 0
3*a-2 = 0
3*a-2 = 0
3*a-2 = 0 // + 2
3*a = 2 // : 3
a = 2/3
a in (-oo:2/3) U (2/3:+oo)
(3*a^2-(8*a)+4)/(3*a-2) = 0
(3*a^2-8*a+4)/(3*a-2) = 0
3*a^2-8*a+4 = 0
3*a^2-8*a+4 = 0
DELTA = (-8)^2-(3*4*4)
DELTA = 16
DELTA > 0
a = (16^(1/2)+8)/(2*3) or a = (8-16^(1/2))/(2*3)
a = 2 or a = 2/3
(a-2/3)*(a-2) = 0
((a-2/3)*(a-2))/(3*a-2) = 0
( a-2/3 )
a-2/3 = 0 // + 2/3
a = 2/3
( a-2 )
a-2 = 0 // + 2
a = 2
a in { 2/3}
a = 2
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