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D( y )
2*y-3 = 0
2*y-3 = 0
2*y-3 = 0
2*y-3 = 0 // + 3
2*y = 3 // : 2
y = 3/2
y in (-oo:3/2) U (3/2:+oo)
(16*y^4-81)/(2*y-3) = 0
16*y^4 = 81 // : 16
y^4 = 81/16
y^4 = 81/16 // ^ 1/4
abs(y) = 3/2
y = 3/2 or y = -3/2
y in { 3/2}
y = -3/2
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