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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
92/x-7 = 0
92*x^-1 = 7 // : 92
x^-1 = 7/92
-1 < 0
1/(x^1) = 7/92 // * x^1
1 = 7/92*x^1 // : 7/92
92/7 = x^1
x = 92/7
x = 92/7
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