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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
15/y = 6/4 // - 6/4
15/y-(6/4) = 0
15/y-3/2 = 0
15*y^-1 = 3/2 // : 15
y^-1 = 1/10
-1 < 0
1/(y^1) = 1/10 // * y^1
1 = 1/10*y^1 // : 1/10
10 = y^1
y = 10
y = 10
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