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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
3/8 = 14/a // - 14/a
3/8-(14/a) = 0
3/8-14*a^-1 = 0
-14*a^-1 = -3/8 // : -14
a^-1 = 3/112
-1 < 0
1/(a^1) = 3/112 // * a^1
1 = 3/112*a^1 // : 3/112
112/3 = a^1
a = 112/3
a = 112/3
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