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D( a )
(4/5)*a = 0
(4/5)*a = 0
(4/5)*a = 0
4/5*a = 0 // : 4/5
a = 0
a in (-oo:0) U (0:+oo)
(8*a-(3*a^2))/((4/5)*a) = 0
(8*a-3*a^2)/((4/5)*a) = 0
(8*a-3*a^2)/(4/5*a) = 0
8*a-3*a^2 = 0
a*(8-3*a) = 0
8-3*a = 0 // - 8
-3*a = -8 // : -3
a = -8/(-3)
a = 8/3
a*(a-8/3) = 0
(a*(a-8/3))/(4/5*a) = 0
( a-8/3 )
a-8/3 = 0 // + 8/3
a = 8/3
( a )
a = 0
a in { 0}
a = 8/3
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