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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25/x+2 = 5/3 // - 5/3
25/x-(5/3)+2 = 0
25/x-5/3+2 = 0
25*x^-1 = -1/3 // : 25
x^-1 = -1/75
-1 < 0
1/(x^1) = -1/75 // * x^1
1 = -1/75*x^1 // : -1/75
-75 = x^1
x = -75
x = -75
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