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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/17 = 13/y // - 13/y
5/17-(13/y) = 0
5/17-13*y^-1 = 0
-13*y^-1 = -5/17 // : -13
y^-1 = 5/221
-1 < 0
1/(y^1) = 5/221 // * y^1
1 = 5/221*y^1 // : 5/221
221/5 = y^1
y = 221/5
y = 221/5
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