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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
400/2400 = 36/x // - 36/x
400/2400-(36/x) = 0
400/2400-36*x^-1 = 0
-36*x^-1 = -1/6 // : -36
x^-1 = 1/216
-1 < 0
1/(x^1) = 1/216 // * x^1
1 = 1/216*x^1 // : 1/216
216 = x^1
x = 216
x = 216
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