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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
4/a = 8/92 // - 8/92
4/a-(8/92) = 0
4/a-2/23 = 0
4*a^-1 = 2/23 // : 4
a^-1 = 1/46
-1 < 0
1/(a^1) = 1/46 // * a^1
1 = 1/46*a^1 // : 1/46
46 = a^1
a = 46
a = 46
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