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D( x )
x^2-49 = 0
x^2-49 = 0
x^2-49 = 0
1*x^2 = 49 // : 1
x^2 = 49
x^2 = 49 // ^ 1/2
abs(x) = 7
x = 7 or x = -7
x in (-oo:-7) U (-7:7) U (7:+oo)
((2*x-14)/(x^2-49))*((x^2+7*x)/4)*(x-x^2) = 0
((2*x-14)*(x^2+7*x)*(x-x^2))/(4*(x^2-49)) = 0
x^2+7*x = 0
x*(x+7) = 0
x+7 = 0 // - 7
x = -7
x*(x+7) = 0
x-x^2 = 0
x*(1-x) = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x*(x-1) = 0
(x^2*(2*x-14)*(x+7)*(x-1))/(4*(x^2-49)) = 0
( 2*x-14 )
2*x-14 = 0 // + 14
2*x = 14 // : 2
x = 14/2
x = 7
( x+7 )
x+7 = 0 // - 7
x = -7
( x-1 )
x-1 = 0 // + 1
x = 1
( x )
x = 0
x in { 7}
x in { -7}
x in { 1, 0, 0 }
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