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D( x )
14*x = 0
7*x = 0
14*x = 0
14*x = 0
14*x = 0 // : 14
x = 0
7*x = 0
7*x = 0
7*x = 0 // : 7
x = 0
x in (-oo:0) U (0:+oo)
2/(7*x)+1/4 = 53/(14*x)-(1/3) // - 53/(14*x)-(1/3)
2/(7*x)-(53/(14*x))+1/4+1/3 = 0
2/(7*x)+(-53/14)*x^-1+1/4+1/3 = 0
-7/2*x^-1 = -7/12 // : -7/2
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
x = 6
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