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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
15/a = 3/2 // - 3/2
15/a-(3/2) = 0
15/a-3/2 = 0
15*a^-1 = 3/2 // : 15
a^-1 = 1/10
-1 < 0
1/(a^1) = 1/10 // * a^1
1 = 1/10*a^1 // : 1/10
10 = a^1
a = 10
a = 10
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