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D( a )
2*a+5 = 0
2*a+5 = 0
2*a+5 = 0
2*a+5 = 0 // - 5
2*a = -5 // : 2
a = -5/2
a in (-oo:-5/2) U (-5/2:+oo)
(8*a^3+27)/(2*a+5) = 0
8*a^3 = -27 // : 8
a^3 = -27/8
a^3 = -27/8 // ^ 1/3
a = -3/2
a = -3/2
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