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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((6*x)/13)*x-7 = x/x+5 // - x/x+5
((6*x)/13)*x-(x/x)-7-5 = 0
((6*x)/13)*x-7-5-1 = 0
6/13*x^2 = 13 // : 6/13
x^2 = 169/6
x^2 = 169/6 // ^ 1/2
abs(x) = (169/6)^(1/2)
x = (169/6)^(1/2) or x = -(169/6)^(1/2)
x in { (169/6)^(1/2), -(169/6)^(1/2) }
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