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D( y )
y-1 = 0
y-7 = 0
y^2-(8*y)+7 = 0
y-1 = 0
y-1 = 0
y-1 = 0 // + 1
y = 1
y-7 = 0
y-7 = 0
y-7 = 0 // + 7
y = 7
y^2-(8*y)+7 = 0
y^2-(8*y)+7 = 0
y^2-8*y+7 = 0
y^2-8*y+7 = 0
DELTA = (-8)^2-(1*4*7)
DELTA = 36
DELTA > 0
y = (36^(1/2)+8)/(1*2) or y = (8-36^(1/2))/(1*2)
y = 7 or y = 1
y in (-oo:1) U (1:7) U (7:+oo)
(y+7)/(y^2-(8*y)+7) = 1/(y-1)-(1/(y-7)) // - 1/(y-1)-(1/(y-7))
(y+7)/(y^2-(8*y)+7)-(1/(y-1))+1/(y-7) = 0
(y+7)/(y^2-8*y+7)-(y-1)^-1+1/(y-7) = 0
(y+7)/(y^2-8*y+7)-1/(y-1)+1/(y-7) = 0
y^2-8*y+7 = 0
y^2-8*y+7 = 0
y^2-8*y+7 = 0
DELTA = (-8)^2-(1*4*7)
DELTA = 36
DELTA > 0
y = (36^(1/2)+8)/(1*2) or y = (8-36^(1/2))/(1*2)
y = 7 or y = 1
(y-1)*(y-7) = 0
(y+7)/((y-1)*(y-7))-1/(y-1)+1/(y-7) = 0
(y+7)/((y-1)*(y-7))+(-1*(y-7))/((y-1)*(y-7))+(1*(y-1))/((y-1)*(y-7)) = 0
1*(y-1)-1*(y-7)+y+7 = 0
y-1+14 = 0
y+13 = 0
(y+13)/((y-1)*(y-7)) = 0
(y+13)/((y-1)*(y-7)) = 0 // * (y-1)*(y-7)
y+13 = 0
y+13 = 0 // - 13
y = -13
y = -13
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