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D( x )
6-(0.6*x) = 0
6-(0.6*x) = 0
6-(0.6*x) = 0
6-0.6*x = 0
6-0.6*x = 0 // - 6
-0.6*x = -6 // : -0.6
x = -6/(-0.6)
x = 10
x in (-oo:10) U (10:+oo)
(6*x-(0.6*x^2))/(6-(0.6*x)) = 0
(6*x-0.6*x^2)/(6-0.6*x) = 0
6*x-0.6*x^2 = 0
x*(6-0.6*x) = 0
6-0.6*x = 0 // - 6
-0.6*x = -6 // : -0.6
x = -6/(-0.6)
x = 10
x*(x-10) = 0
(x*(x-10))/(6-0.6*x) = 0
( x-10 )
x-10 = 0 // + 10
x = 10
( x )
x = 0
x in { 10}
x = 0
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