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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1/a = 2/14 // - 2/14
1/a-(2/14) = 0
1/a-1/7 = 0
1*a^-1 = 1/7 // : 1
a^-1 = 1/7
-1 < 0
1/(a^1) = 1/7 // * a^1
1 = 1/7*a^1 // : 1/7
7 = a^1
a = 7
a = 7
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