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