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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
7/3 = 2/(x-5) // - 2/(x-5)
7/3-(2/(x-5)) = 0
7/3-2*(x-5)^-1 = 0
7/3-2/(x-5) = 0
(-2*3)/(3*(x-5))+(7*(x-5))/(3*(x-5)) = 0
7*(x-5)-2*3 = 0
7*x-41 = 0
(7*x-41)/(3*(x-5)) = 0
(7*x-41)/(3*(x-5)) = 0 // * 3*(x-5)
7*x-41 = 0
7*x-41 = 0 // + 41
7*x = 41 // : 7
x = 41/7
x = 41/7
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