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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6/y = 18/51 // - 18/51
6/y-(18/51) = 0
6/y-6/17 = 0
6*y^-1 = 6/17 // : 6
y^-1 = 1/17
-1 < 0
1/(y^1) = 1/17 // * y^1
1 = 1/17*y^1 // : 1/17
17 = y^1
y = 17
y = 17
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