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D( w )
3*w+1 = 0
3*w+1 = 0
3*w+1 = 0
3*w+1 = 0 // - 1
3*w = -1 // : 3
w = -1/3
w in (-oo:-1/3) U (-1/3:+oo)
w*((28*w)/(3*w+1))+3*w^2+25*w^2 = 0
(28*w*w)/(3*w+1)+3*w^2+25*w^2 = 0
(28*w*w)/(3*w+1)+(3*w^2*(3*w+1))/(3*w+1)+(25*w^2*(3*w+1))/(3*w+1) = 0
3*w^2*(3*w+1)+25*w^2*(3*w+1)+28*w*w = 0
9*w^3+75*w^3+31*w^2+25*w^2 = 0
84*w^3+56*w^2 = 0
84*w^3+56*w^2 = 0
28*w^2*(3*w+2) = 0
3*w+2 = 0 // - 2
3*w = -2 // : 3
w = -2/3
28*w^2*(w+2/3) = 0
(28*w^2*(w+2/3))/(3*w+1) = 0
(28*w^2*(w+2/3))/(3*w+1) = 0 // * 3*w+1
28*w^2*(w+2/3) = 0
( 28*w^2 )
28*w^2 = 0 // : 28
w^2 = 0
w = 0
( w+2/3 )
w+2/3 = 0 // - 2/3
w = -2/3
w in { 0, -2/3 }
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