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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x-1)/x = 7 // - 7
(2*x-1)/x-7 = 0
(2*x-1)/x+(-7*x)/x = 0
2*x-7*x-1 = 0
-5*x-1 = 0
(-5*x-1)/x = 0
(-5*x-1)/x = 0 // * x
-5*x-1 = 0
-5*x-1 = 0 // + 1
-5*x = 1 // : -5
x = 1/(-5)
x = -1/5
x = -1/5
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