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