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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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