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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x+((9/x)/13)*x = 0
4*x+9/13 = 0 // - 9/13
4*x = -9/13 // : 4
x = -9/13/4
x = -9/52
x = -9/52
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