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D( y )
y-10 = 0
y-10 = 0
y-10 = 0
y-10 = 0 // + 10
y = 10
y in (-oo:10) U (10:+oo)
(8*y)/(y-10)+1 = (7*y)/(y-10) // - (7*y)/(y-10)
(8*y)/(y-10)-((7*y)/(y-10))+1 = 0
(8*y)/(y-10)-7*y*(y-10)^-1+1 = 0
(8*y)/(y-10)+(-7*y)/(y-10)+1 = 0
(8*y)/(y-10)+(-7*y)/(y-10)+(1*(y-10))/(y-10) = 0
1*(y-10)+8*y-7*y = 0
y+y-10 = 0
2*y-10 = 0
(2*y-10)/(y-10) = 0
(2*y-10)/(y-10) = 0 // * y-10
2*y-10 = 0
2*y-10 = 0 // + 10
2*y = 10 // : 2
y = 10/2
y = 5
y = 5
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