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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
40/60 = 560/x // - 560/x
40/60-(560/x) = 0
40/60-560*x^-1 = 0
-560*x^-1 = -2/3 // : -560
x^-1 = 1/840
-1 < 0
1/(x^1) = 1/840 // * x^1
1 = 1/840*x^1 // : 1/840
840 = x^1
x = 840
x = 840
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