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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/3 = 16/x-7 // - 16/x-7
2/3-(16/x)+7 = 0
2/3-16*x^-1+7 = 0
-16*x^-1 = -23/3 // : -16
x^-1 = 23/48
-1 < 0
1/(x^1) = 23/48 // * x^1
1 = 23/48*x^1 // : 23/48
48/23 = x^1
x = 48/23
x = 48/23
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