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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y+1/16 = 1/12 // - 1/12
1/y+1/16-(1/12) = 0
1/y+1/16-1/12 = 0
1*y^-1 = 1/48 // : 1
y^-1 = 1/48
-1 < 0
1/(y^1) = 1/48 // * y^1
1 = 1/48*y^1 // : 1/48
48 = y^1
y = 48
y = 48
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