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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1.5 = 3/y // - 3/y
1.5-(3/y) = 0
1.5-3*y^-1 = 0
-3*y^-1 = -1.5 // : -3
y^-1 = 0.5
-1 < 0
1/(y^1) = 0.5 // * y^1
1 = 0.5*y^1 // : 0.5
2 = y^1
y = 2
y = 2
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