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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = 6/x+7 // - 6/x+7
15/x-(6/x)-7 = 0
15/x-6*x^-1-7 = 0
9*x^-1 = 7 // : 9
x^-1 = 7/9
-1 < 0
1/(x^1) = 7/9 // * x^1
1 = 7/9*x^1 // : 7/9
9/7 = x^1
x = 9/7
x = 9/7
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