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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6/a = 3/100 // - 3/100
6/a-(3/100) = 0
6/a-3/100 = 0
6*a^-1 = 3/100 // : 6
a^-1 = 1/200
-1 < 0
1/(a^1) = 1/200 // * a^1
1 = 1/200*a^1 // : 1/200
200 = a^1
a = 200
a = 200
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