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D( x )
7*x-14 = 0
7*x-14 = 0
7*x-14 = 0
7*x-14 = 0 // + 14
7*x = 14 // : 7
x = 14/7
x = 2
x in (-oo:2) U (2:+oo)
((x/(7*x-14))*(x^2-(2*x)))/8 = 0
((x/(7*x-14))*(x^2-2*x))/8 = 0
(x*(x^2-2*x))/(8*(7*x-14)) = 0
x^2-2*x = 0
x*(x-2) = 0
x-2 = 0 // + 2
x = 2
x*(x-2) = 0
(x^2*(x-2))/(8*(7*x-14)) = 0
( x-2 )
x-2 = 0 // + 2
x = 2
( x )
x = 0
x in { 2}
x in { 0, 0 }
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