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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-45/x-26 = 0
-45*x^-1 = 26 // : -45
x^-1 = -26/45
-1 < 0
1/(x^1) = -26/45 // * x^1
1 = -26/45*x^1 // : -26/45
-45/26 = x^1
x = -45/26
x = -45/26
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