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