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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
5/a = 3/10 // - 3/10
5/a-(3/10) = 0
5/a-3/10 = 0
5*a^-1 = 3/10 // : 5
a^-1 = 3/50
-1 < 0
1/(a^1) = 3/50 // * a^1
1 = 3/50*a^1 // : 3/50
50/3 = a^1
a = 50/3
a = 50/3
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