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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
19/a = 16/32 // - 16/32
19/a-(16/32) = 0
19/a-1/2 = 0
19*a^-1 = 1/2 // : 19
a^-1 = 1/38
-1 < 0
1/(a^1) = 1/38 // * a^1
1 = 1/38*a^1 // : 1/38
38 = a^1
a = 38
a = 38
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