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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+5/6 = 0
2*x^-1 = -5/6 // : 2
x^-1 = -5/12
-1 < 0
1/(x^1) = -5/12 // * x^1
1 = -5/12*x^1 // : -5/12
-12/5 = x^1
x = -12/5
x = -12/5
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