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D( q )

q = 0

q = 0

q = 0

q in (-oo:0) U (0:+oo)

32/5 = 97.5/q / - 97.5/q

32/5-(97.5/q) = 0

32/5-97.5*q^-1 = 0

-97.5*q^-1 = -32/5 / : -97.5

q^-1 = 0.06564103

-1 < 0

1/(q^1) = 0.06564103 / * q^1

1 = 0.06564103*q^1 / : 0.06564103

15.23437399 = q^1

q = 15.23437399

q = 15.23437399

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