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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x+5 = 8/3 // - 8/3
16/x-(8/3)+5 = 0
16/x-8/3+5 = 0
16*x^-1 = -7/3 // : 16
x^-1 = -7/48
-1 < 0
1/(x^1) = -7/48 // * x^1
1 = -7/48*x^1 // : -7/48
-48/7 = x^1
x = -48/7
x = -48/7
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