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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
7/a-4 = 14/6 // - 14/6
7/a-(14/6)-4 = 0
7/a-7/3-4 = 0
7*a^-1 = 19/3 // : 7
a^-1 = 19/21
-1 < 0
1/(a^1) = 19/21 // * a^1
1 = 19/21*a^1 // : 19/21
21/19 = a^1
a = 21/19
a = 21/19
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