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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1206.4/x = 52 // - 52
1206.4/x-52 = 0
1206.4*x^-1 = 52 // : 1206.4
x^-1 = 0.04310345
-1 < 0
1/(x^1) = 0.04310345 // * x^1
1 = 0.04310345*x^1 // : 0.04310345
23.19999907 = x^1
x = 23.19999907
x = 23.19999907
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