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