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D( w )
w+5 = 0
2*w+10 = 0
w+5 = 0
w+5 = 0
w+5 = 0 // - 5
w = -5
2*w+10 = 0
2*w+10 = 0
2*w+10 = 0 // - 10
2*w = -10 // : 2
w = -10/2
w = -5
w in (-oo:-5) U (-5:+oo)
2/(w+5) = 3/(2*w+10)+4 // - 3/(2*w+10)+4
2/(w+5)-(3/(2*w+10))-4 = 0
2/(w+5)-3*(2*w+10)^-1-4 = 0
2/(w+5)-3/(2*w+10)-4 = 0
(2*(2*w+10))/((w+5)*(2*w+10))+(-3*(w+5))/((w+5)*(2*w+10))+(-4*(w+5)*(2*w+10))/((w+5)*(2*w+10)) = 0
2*(2*w+10)-3*(w+5)-4*(w+5)*(2*w+10) = 0
w-8*w^2-80*w-200+5 = 0
-8*w^2-79*w-195 = 0
-8*w^2-79*w-195 = 0
-1*(8*w^2+79*w+195) = 0
8*w^2+79*w+195 = 0
DELTA = 79^2-(4*8*195)
DELTA = 1
DELTA > 0
w = (1^(1/2)-79)/(2*8) or w = (-1^(1/2)-79)/(2*8)
w = -39/8 or w = -5
-1*(w+5)*(w+39/8) = 0
(-1*(w+5)*(w+39/8))/((w+5)*(2*w+10)) = 0
(-1*(w+5)*(w+39/8))/((w+5)*(2*w+10)) = 0 // * (w+5)*(2*w+10)
-1*(w+5)*(w+39/8) = 0
( w+39/8 )
w+39/8 = 0 // - 39/8
w = -39/8
( w+5 )
w+5 = 0 // - 5
w = -5
w in { -5}
w = -39/8
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