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D( x )
12-(2*x^5) = 0
12-(2*x^5) = 0
12-(2*x^5) = 0
12-2*x^5 = 0
-2*x^5 = -12 // : -2
x^5 = 6
x^5 = 6 // ^ 1/5
x = 6^(1/5)
x in (-oo:6^(1/5)) U (6^(1/5):+oo)
12/(12-(2*x^5))+6 = 0
12/(12-2*x^5)+6 = 0
12/(12-2*x^5)+(6*(12-2*x^5))/(12-2*x^5) = 0
6*(12-2*x^5)+12 = 0
84-12*x^5 = 0
(84-12*x^5)/(12-2*x^5) = 0
(84-12*x^5)/(12-2*x^5) = 0 // * 12-2*x^5
84-12*x^5 = 0
-12*x^5 = -84 // : -12
x^5 = 7
x^5 = 7 // ^ 1/5
x = 7^(1/5)
x = 7^(1/5)
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