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D( x )
6*x = 0
2*x = 0
6*x = 0
6*x = 0
6*x = 0 // : 6
x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
58/(6*x)-6/(2*x) = 10/6 // - 10/6
58/(6*x)-6/(2*x)-(10/6) = 0
58/(6*x)-6/(2*x)-5/3 = 0
20/3*x^-1 = 5/3 // : 20/3
x^-1 = 1/4
-1 < 0
1/(x^1) = 1/4 // * x^1
1 = 1/4*x^1 // : 1/4
4 = x^1
x = 4
x = 4
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