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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
5/a+10/a+1 = 0
15*a^-1 = -1 // : 15
a^-1 = -1/15
-1 < 0
1/(a^1) = -1/15 // * a^1
1 = -1/15*a^1 // : -1/15
-15 = a^1
a = -15
a = -15
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