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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(7/x)-2 = 5/3 // - 5/3
X-(7/x)-(5/3)-2 = 0
X-7*x^-1-5/3-2 = 0
-7*x^-1 = -(X-11/3) // : -7
x^-1 = (11/3-X)/(-7)
-1 < 0
1/(x^1) = (11/3-X)/(-7) // * x^1
1 = x^1*((11/3-X)/(-7)) // : (11/3-X)/(-7)
-7*(11/3-X)^-1 = x^1
x = -7*(11/3-X)^-1
x = -7*(11/3-X)^-1
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