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