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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
65/127 = 60/x // - 60/x
65/127-(60/x) = 0
65/127-60*x^-1 = 0
-60*x^-1 = -65/127 // : -60
x^-1 = 13/1524
-1 < 0
1/(x^1) = 13/1524 // * x^1
1 = 13/1524*x^1 // : 13/1524
1524/13 = x^1
x = 1524/13
x = 1524/13
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