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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10-396/x = 22 // - 22
10-396/x-22 = 0
-396*x^-1 = 12 // : -396
x^-1 = -1/33
-1 < 0
1/(x^1) = -1/33 // * x^1
1 = -1/33*x^1 // : -1/33
-33 = x^1
x = -33
x = -33
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