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