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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6/y = 3/4 // - 3/4
6/y-(3/4) = 0
6/y-3/4 = 0
6*y^-1 = 3/4 // : 6
y^-1 = 1/8
-1 < 0
1/(y^1) = 1/8 // * y^1
1 = 1/8*y^1 // : 1/8
8 = y^1
y = 8
y = 8
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