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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
46.8 = 2340/a // - 2340/a
46.8-(2340/a) = 0
46.8-2340*a^-1 = 0
-2340*a^-1 = -46.8 // : -2340
a^-1 = 0.02
-1 < 0
1/(a^1) = 0.02 // * a^1
1 = 0.02*a^1 // : 0.02
50 = a^1
a = 50
a = 50
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