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D( w )
w^2+7*w-8 = 0
w+8 = 0
w^2+7*w-8 = 0
w^2+7*w-8 = 0
w^2+7*w-8 = 0
DELTA = 7^2-(-8*1*4)
DELTA = 81
DELTA > 0
w = (81^(1/2)-7)/(1*2) or w = (-81^(1/2)-7)/(1*2)
w = 1 or w = -8
w+8 = 0
w+8 = 0
w+8 = 0 // - 8
w = -8
w in (-oo:-8) U (-8:1) U (1:+oo)
-(18/(w^2+7*w-8)) = -((3*w)/(w+8)) // + (3*w)/(w+8)
(3*w)/(w+8)-(18/(w^2+7*w-8)) = 0
(3*w)/(w+8)-18*(w^2+7*w-8)^-1 = 0
(3*w)/(w+8)-18/(w^2+7*w-8) = 0
w^2+7*w-8 = 0
w^2+7*w-8 = 0
w^2+7*w-8 = 0
DELTA = 7^2-(-8*1*4)
DELTA = 81
DELTA > 0
w = (81^(1/2)-7)/(1*2) or w = (-81^(1/2)-7)/(1*2)
w = 1 or w = -8
(w+8)*(w-1) = 0
(3*w)/(w+8)-18/((w+8)*(w-1)) = 0
(3*w*(w-1))/((w+8)*(w-1))-18/((w+8)*(w-1)) = 0
3*w*(w-1)-18 = 0
3*w^2-3*w-18 = 0
3*w^2-3*w-18 = 0
3*(w^2-w-6) = 0
w^2-w-6 = 0
DELTA = (-1)^2-(-6*1*4)
DELTA = 25
DELTA > 0
w = (25^(1/2)+1)/(1*2) or w = (1-25^(1/2))/(1*2)
w = 3 or w = -2
3*(w+2)*(w-3) = 0
(3*(w+2)*(w-3))/((w+8)*(w-1)) = 0
(3*(w+2)*(w-3))/((w+8)*(w-1)) = 0 // * (w+8)*(w-1)
3*(w+2)*(w-3) = 0
( w+2 )
w+2 = 0 // - 2
w = -2
( w-3 )
w-3 = 0 // + 3
w = 3
w in { -2, 3 }
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