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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)
(6*x-19)/(6*x+1) = 5 // - 5
(6*x-19)/(6*x+1)-5 = 0
(6*x-19)/(6*x+1)+(-5*(6*x+1))/(6*x+1) = 0
6*x-5*(6*x+1)-19 = 0
-24*x-24 = 0
(-24*x-24)/(6*x+1) = 0
(-24*x-24)/(6*x+1) = 0 // * 6*x+1
-24*x-24 = 0
-24*x-24 = 0 // + 24
-24*x = 24 // : -24
x = 24/(-24)
x = -1
x = -1
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