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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6/8 = 15/y // - 15/y
6/8-(15/y) = 0
6/8-15*y^-1 = 0
-15*y^-1 = -3/4 // : -15
y^-1 = 1/20
-1 < 0
1/(y^1) = 1/20 // * y^1
1 = 1/20*y^1 // : 1/20
20 = y^1
y = 20
y = 20
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