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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
5/14 = 4/a // - 4/a
5/14-(4/a) = 0
5/14-4*a^-1 = 0
-4*a^-1 = -5/14 // : -4
a^-1 = 5/56
-1 < 0
1/(a^1) = 5/56 // * a^1
1 = 5/56*a^1 // : 5/56
56/5 = a^1
a = 56/5
a = 56/5
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