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D( x )
7*x^2-x^3 = 0
7*x^2-x^3 = 0
7*x^2-x^3 = 0
7*x^2-x^3 = 0
x^2*(7-x) = 0
7-x = 0 // - 7
-x = -7 // * -1
x = 7
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:7) U (7:+oo)
(49*x-x^3)/(7*x^2-x^3) = 0
49*x-x^3 = 0
x*(49-x^2) = 0
-1*x^2 = -49 // : -1
x^2 = 49
x^2 = 49 // ^ 1/2
abs(x) = 7
x = 7 or x = -7
x*(x-7)*(x+7) = 0
7*x^2-x^3 = 0
x^2*(7-x) = 0
7-x = 0 // - 7
-x = -7 // * -1
x = 7
x^2*(x-7) = 0
(x*(x-7)*(x+7))/(x^2*(x-7)) = 0
( x+7 )
x+7 = 0 // - 7
x = -7
( x-7 )
x-7 = 0 // + 7
x = 7
( x )
x = 0
x in { 7}
x in { 0}
x = -7
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