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D( x )
6*x-3 = 0
6*x-3 = 0
6*x-3 = 0
6*x-3 = 0 // + 3
6*x = 3 // : 6
x = 3/6
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
5/11 = -((5*x-1)/(6*x-3)) // + (5*x-1)/(6*x-3)
(5*x-1)/(6*x-3)+5/11 = 0
(11*(5*x-1))/(11*(6*x-3))+(5*(6*x-3))/(11*(6*x-3)) = 0
11*(5*x-1)+5*(6*x-3) = 0
85*x-26 = 0
(85*x-26)/(11*(6*x-3)) = 0
(85*x-26)/(11*(6*x-3)) = 0 // * 11*(6*x-3)
85*x-26 = 0
85*x-26 = 0 // + 26
85*x = 26 // : 85
x = 26/85
x = 26/85
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