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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+1/3+5/6 = 0
6*x^-1 = -7/6 // : 6
x^-1 = -7/36
-1 < 0
1/(x^1) = -7/36 // * x^1
1 = -7/36*x^1 // : -7/36
-36/7 = x^1
x = -36/7
x = -36/7
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