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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1.6 = 1.5/y // - 1.5/y
1.6-(1.5/y) = 0
1.6-1.5*y^-1 = 0
-1.5*y^-1 = -1.6 // : -1.5
y^-1 = 1.06666667
-1 < 0
1/(y^1) = 1.06666667 // * y^1
1 = 1.06666667*y^1 // : 1.06666667
0.9375 = y^1
y = 0.9375
y = 0.9375
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