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D( a )
5*a-2 = 0
5*a-2 = 0
5*a-2 = 0
5*a-2 = 0 // + 2
5*a = 2 // : 5
a = 2/5
a in (-oo:2/5) U (2/5:+oo)
2*a-4 = 1/(5*a-2) // - 1/(5*a-2)
2*a-(1/(5*a-2))-4 = 0
2*a-(5*a-2)^-1-4 = 0
2*a-1/(5*a-2)-4 = 0
(2*a*(5*a-2))/(5*a-2)-1/(5*a-2)+(-4*(5*a-2))/(5*a-2) = 0
2*a*(5*a-2)-4*(5*a-2)-1 = 0
10*a^2-4*a-20*a-1+8 = 0
10*a^2-24*a+7 = 0
10*a^2-24*a+7 = 0
10*a^2-24*a+7 = 0
DELTA = (-24)^2-(4*7*10)
DELTA = 296
DELTA > 0
a = (296^(1/2)+24)/(2*10) or a = (24-296^(1/2))/(2*10)
a = (2*74^(1/2)+24)/20 or a = (24-2*74^(1/2))/20
(a-((24-2*74^(1/2))/20))*(a-((2*74^(1/2)+24)/20)) = 0
((a-((24-2*74^(1/2))/20))*(a-((2*74^(1/2)+24)/20)))/(5*a-2) = 0
((a-((24-2*74^(1/2))/20))*(a-((2*74^(1/2)+24)/20)))/(5*a-2) = 0 // * 5*a-2
(a-((24-2*74^(1/2))/20))*(a-((2*74^(1/2)+24)/20)) = 0
( a-((2*74^(1/2)+24)/20) )
a-((2*74^(1/2)+24)/20) = 0 // + (2*74^(1/2)+24)/20
a = (2*74^(1/2)+24)/20
( a-((24-2*74^(1/2))/20) )
a-((24-2*74^(1/2))/20) = 0 // + (24-2*74^(1/2))/20
a = (24-2*74^(1/2))/20
a in { (2*74^(1/2)+24)/20, (24-2*74^(1/2))/20 }
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