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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)
5/11-((5*x-1)/(6*x-3)) = 0
(-1*(5*x-1))/(6*x-3)+5/11 = 0
(-1*11*(5*x-1))/(11*(6*x-3))+(5*(6*x-3))/(11*(6*x-3)) = 0
5*(6*x-3)-1*11*(5*x-1) = 0
-25*x-4 = 0
(-25*x-4)/(11*(6*x-3)) = 0
(-25*x-4)/(11*(6*x-3)) = 0 // * 11*(6*x-3)
-25*x-4 = 0
-25*x-4 = 0 // + 4
-25*x = 4 // : -25
x = 4/(-25)
x = -4/25
x = -4/25
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