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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/8 = 5/x-6 // - 5/x-6
3/8-(5/x)+6 = 0
3/8-5*x^-1+6 = 0
-5*x^-1 = -51/8 // : -5
x^-1 = 51/40
-1 < 0
1/(x^1) = 51/40 // * x^1
1 = 51/40*x^1 // : 51/40
40/51 = x^1
x = 40/51
x = 40/51
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