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D( y )
y-6 = 0
y-6 = 0
y-6 = 0
y-6 = 0 // + 6
y = 6
y in (-oo:6) U (6:+oo)
5 = -7/(y-6) // + -7/(y-6)
5-(-7/(y-6)) = 0
7*(y-6)^-1+5 = 0
7/(y-6)+5 = 0
7/(y-6)+(5*(y-6))/(y-6) = 0
5*(y-6)+7 = 0
5*y-23 = 0
(5*y-23)/(y-6) = 0
(5*y-23)/(y-6) = 0 // * y-6
5*y-23 = 0
5*y-23 = 0 // + 23
5*y = 23 // : 5
y = 23/5
y = 23/5
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