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d in (-oo:+oo)
(1/6)*d*(3*d-4) = 0
1/6*d*(3*d-4) = 0
( 1/6*d )
1/6*d = 0 // : 1/6
d = 0
( 3*d-4 )
3*d-4 = 0 // + 4
3*d = 4 // : 3
d = 4/3
d in { 0, 4/3 }
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