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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
10/a = 5 // - 5
10/a-5 = 0
10*a^-1 = 5 // : 10
a^-1 = 1/2
-1 < 0
1/(a^1) = 1/2 // * a^1
1 = 1/2*a^1 // : 1/2
2 = a^1
a = 2
a = 2
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