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D( a )
a = 0
a-5 = 0
a = 0
a = 0
a-5 = 0
a-5 = 0
a-5 = 0 // + 5
a = 5
a in (-oo:0) U (0:5) U (5:+oo)
5/(a-5)-(1/a) = a/(a-5) // - a/(a-5)
5/(a-5)-(a/(a-5))-(1/a) = 0
5/(a-5)-(a/(a-5))-a^-1 = 0
5/(a-5)+(-1*a)/(a-5)-1/a = 0
(5*a)/(a*(a-5))+(-1*a^2)/(a*(a-5))+(-1*(a-5))/(a*(a-5)) = 0
5*a-1*(a-5)-1*a^2 = 0
5*a-a^2-a+5 = 0
4*a-a^2+5 = 0
4*a-a^2+5 = 0
4*a-a^2+5 = 0
DELTA = 4^2-(-1*4*5)
DELTA = 36
DELTA > 0
a = (36^(1/2)-4)/(-1*2) or a = (-36^(1/2)-4)/(-1*2)
a = -1 or a = 5
(a+1)*(a-5) = 0
((a+1)*(a-5))/(a*(a-5)) = 0
((a+1)*(a-5))/(a*(a-5)) = 0 // * a*(a-5)
(a+1)*(a-5) = 0
( a+1 )
a+1 = 0 // - 1
a = -1
( a-5 )
a-5 = 0 // + 5
a = 5
a in { 5}
a = -1
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