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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/120 = 2/y // - 2/y
8/120-(2/y) = 0
8/120-2*y^-1 = 0
-2*y^-1 = -1/15 // : -2
y^-1 = 1/30
-1 < 0
1/(y^1) = 1/30 // * y^1
1 = 1/30*y^1 // : 1/30
30 = y^1
y = 30
y = 30
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