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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
5/a-27 = -7 // + 7
5/a-27+7 = 0
5*a^-1 = 20 // : 5
a^-1 = 4
-1 < 0
1/(a^1) = 4 // * a^1
1 = 4*a^1 // : 4
1/4 = a^1
a = 1/4
a = 1/4
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