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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
6/14 = 7/(x-3) // - 7/(x-3)
6/14-(7/(x-3)) = 0
6/14-7*(x-3)^-1 = 0
3/7-7/(x-3) = 0
(-7*7)/(7*(x-3))+(3*(x-3))/(7*(x-3)) = 0
3*(x-3)-7*7 = 0
3*x-58 = 0
(3*x-58)/(7*(x-3)) = 0
(3*x-58)/(7*(x-3)) = 0 // * 7*(x-3)
3*x-58 = 0
3*x-58 = 0 // + 58
3*x = 58 // : 3
x = 58/3
x = 58/3
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