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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)
((2*x^2-(10*x))/(6*x-1))*((x-5)/(6*x-1)) = 0
((2*x^2-10*x)/(6*x-1))*((x-5)/(6*x-1)) = 0
((2*x^2-10*x)*(x-5))/((6*x-1)^2) = 0
2*x^2-10*x = 0
2*x*(x-5) = 0
x-5 = 0 // + 5
x = 5
2*x*(x-5) = 0
(2*x*(x-5)^2)/((6*x-1)^2) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( x-5 )
x-5 = 0 // + 5
x = 5
x in { 0, 5, 5 }
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