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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
14.8 = 2960/a // - 2960/a
14.8-(2960/a) = 0
14.8-2960*a^-1 = 0
-2960*a^-1 = -14.8 // : -2960
a^-1 = 0.005
-1 < 0
1/(a^1) = 0.005 // * a^1
1 = 0.005*a^1 // : 0.005
200 = a^1
a = 200
a = 200
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