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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x-34)/x = 7 // - 7
(6*x-34)/x-7 = 0
(6*x-34)/x+(-7*x)/x = 0
6*x-7*x-34 = 0
-x-34 = 0
(-x-34)/x = 0
(-x-34)/x = 0 // * x
-x-34 = 0
-x-34 = 0 // + 34
-x = 34 // * -1
x = -34
x = -34
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