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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x+29 = 3 // - 3
7/x-3+29 = 0
7*x^-1 = -26 // : 7
x^-1 = -26/7
-1 < 0
1/(x^1) = -26/7 // * x^1
1 = -26/7*x^1 // : -26/7
-7/26 = x^1
x = -7/26
x = -7/26
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