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D( x )
x-((2/12)*x) = 0
x-((2/12)*x) = 0
x-((2/12)*x) = 0
x+(-1/6)*x = 0
5/6*x = 0 // : 5/6
x = 0
x in (-oo:0) U (0:+oo)
(10-((5*x)/3))/(x-((2/12)*x)) = 0
((-5/3)*x+10)/(x+(-1/6)*x) = 0
(10-5/3*x)/(5/6*x) = 0
10-5/3*x = 0 // - 10
-5/3*x = -10 // : -5/3
x = -10/(-5/3)
x = 6
x = 6
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