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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2/a+2/5-8 = 0
2*a^-1 = 38/5 // : 2
a^-1 = 19/5
-1 < 0
1/(a^1) = 19/5 // * a^1
1 = 19/5*a^1 // : 19/5
5/19 = a^1
a = 5/19
a = 5/19
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