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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
17/12 = 34/y // - 34/y
17/12-(34/y) = 0
17/12-34*y^-1 = 0
-34*y^-1 = -17/12 // : -34
y^-1 = 1/24
-1 < 0
1/(y^1) = 1/24 // * y^1
1 = 1/24*y^1 // : 1/24
24 = y^1
y = 24
y = 24
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