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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
13/y = 3/17 // - 3/17
13/y-(3/17) = 0
13/y-3/17 = 0
13*y^-1 = 3/17 // : 13
y^-1 = 3/221
-1 < 0
1/(y^1) = 3/221 // * y^1
1 = 3/221*y^1 // : 3/221
221/3 = y^1
y = 221/3
y = 221/3
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