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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.3/9.7 = 12.6/x // - 12.6/x
6.3/9.7-(12.6/x) = 0
6.3/9.7-12.6*x^-1 = 0
-12.6*x^-1 = -0.64948454 // : -12.6
x^-1 = 0.05154639
-1 < 0
1/(x^1) = 0.05154639 // * x^1
1 = 0.05154639*x^1 // : 0.05154639
19.40000066 = x^1
x = 19.40000066
x = 19.40000066
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