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D( y )
y-4 = 0
y-4 = 0
y-4 = 0
y-4 = 0 // + 4
y = 4
y in (-oo:4) U (4:+oo)
1/(y-4) = -8 // + 8
1/(y-4)+8 = 0
1/(y-4)+(8*(y-4))/(y-4) = 0
8*(y-4)+1 = 0
8*y-31 = 0
(8*y-31)/(y-4) = 0
(8*y-31)/(y-4) = 0 // * y-4
8*y-31 = 0
8*y-31 = 0 // + 31
8*y = 31 // : 8
y = 31/8
y = 31/8
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