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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
9/y+12 = 5/9+2 // - 5/9+2
9/y-(5/9)-2+12 = 0
9/y-5/9-2+12 = 0
9*y^-1 = -85/9 // : 9
y^-1 = -85/81
-1 < 0
1/(y^1) = -85/81 // * y^1
1 = -85/81*y^1 // : -85/81
-81/85 = y^1
y = -81/85
y = -81/85
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