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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6/a = 1.2/7 // - 1.2/7
6/a-(1.2/7) = 0
6/a-0.17142857 = 0
6*a^-1 = 0.17142857 // : 6
a^-1 = 0.02857143
-1 < 0
1/(a^1) = 0.02857143 // * a^1
1 = 0.02857143*a^1 // : 0.02857143
34.99999825 = a^1
a = 34.99999825
a = 34.99999825
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