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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+5/x-2 = x-(7/x)+3 // - x-(7/x)+3
x-x+5/x+7/x-3-2 = 0
12*x^-1 = 5 // : 12
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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