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D( y )
y-14 = 0
y-14 = 0
y-14 = 0
y-14 = 0 // + 14
y = 14
y in (-oo:14) U (14:+oo)
1/3 = 17/(y-14) // - 17/(y-14)
1/3-(17/(y-14)) = 0
1/3-17*(y-14)^-1 = 0
1/3-17/(y-14) = 0
(-17*3)/(3*(y-14))+(1*(y-14))/(3*(y-14)) = 0
1*(y-14)-17*3 = 0
y-65 = 0
(y-65)/(3*(y-14)) = 0
(y-65)/(3*(y-14)) = 0 // * 3*(y-14)
y-65 = 0
y-65 = 0 // + 65
y = 65
y = 65
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