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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.4/x = 400 // - 400
2.4/x-400 = 0
2.4*x^-1 = 400 // : 2.4
x^-1 = 166.66666667
-1 < 0
1/(x^1) = 166.66666667 // * x^1
1 = 166.66666667*x^1 // : 166.66666667
0.006 = x^1
x = 0.006
x = 0.006
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