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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1/a-((4/3)*a) = 1/5 // - 1/5
1/a-((4/3)*a)-(1/5) = 0
(-4/3)*a+1/a-1/5 = 0
1*a^-1-4/3*a^1-1/5*a^0 = 0
(1*a^0-4/3*a^2-1/5*a^1)/(a^1) = 0 // * a^2
a^1*(1*a^0-4/3*a^2-1/5*a^1) = 0
a^1
(-4/3)*a^2+(-1/5)*a+1 = 0
(-4/3)*a^2+(-1/5)*a+1 = 0
DELTA = (-1/5)^2-(1*4*(-4/3))
DELTA = 403/75
DELTA > 0
a = ((403/75)^(1/2)-(-1/5))/(2*(-4/3)) or a = (-(-1/5)-(403/75)^(1/2))/(2*(-4/3))
a = -3/8*((403/75)^(1/2)+1/5) or a = -3/8*(1/5-(403/75)^(1/2))
a in { -3/8*((403/75)^(1/2)+1/5), -3/8*(1/5-(403/75)^(1/2))}
a in { -3/8*((403/75)^(1/2)+1/5), -3/8*(1/5-(403/75)^(1/2)) }
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