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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6/8 = 7/a // - 7/a
6/8-(7/a) = 0
6/8-7*a^-1 = 0
-7*a^-1 = -3/4 // : -7
a^-1 = 3/28
-1 < 0
1/(a^1) = 3/28 // * a^1
1 = 3/28*a^1 // : 3/28
28/3 = a^1
a = 28/3
a = 28/3
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