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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 (-5:5) U (5:+oo)
2-5/(2*w-10) = 1/(w+5) // - 1/(w+5)
2-5/(2*w-10)-(1/(w+5)) = 0
2-5/(2*w-10)-(w+5)^-1 = 0
2-5/(2*w-10)-1/(w+5) = 0
(-5*(w+5))/((2*w-10)*(w+5))+(-1*(2*w-10))/((2*w-10)*(w+5))+(2*(2*w-10)*(w+5))/((2*w-10)*(w+5)) = 0
2*(2*w-10)*(w+5)-5*(w+5)-1*(2*w-10) = 0
4*w^2-7*w-100-15 = 0
4*w^2-7*w-115 = 0
4*w^2-7*w-115 = 0
4*w^2-7*w-115 = 0
DELTA = (-7)^2-(-115*4*4)
DELTA = 1889
DELTA > 0
w = (1889^(1/2)+7)/(2*4) or w = (7-1889^(1/2))/(2*4)
w = (1889^(1/2)+7)/8 or w = (7-1889^(1/2))/8
(w-((7-1889^(1/2))/8))*(w-((1889^(1/2)+7)/8)) = 0
((w-((7-1889^(1/2))/8))*(w-((1889^(1/2)+7)/8)))/((2*w-10)*(w+5)) = 0
((w-((7-1889^(1/2))/8))*(w-((1889^(1/2)+7)/8)))/((2*w-10)*(w+5)) = 0 // * (2*w-10)*(w+5)
(w-((7-1889^(1/2))/8))*(w-((1889^(1/2)+7)/8)) = 0
( w-((1889^(1/2)+7)/8) )
w-((1889^(1/2)+7)/8) = 0 // + (1889^(1/2)+7)/8
w = (1889^(1/2)+7)/8
( w-((7-1889^(1/2))/8) )
w-((7-1889^(1/2))/8) = 0 // + (7-1889^(1/2))/8
w = (7-1889^(1/2))/8
w in { (1889^(1/2)+7)/8, (7-1889^(1/2))/8 }
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