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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1.5/y = 3/9 // - 3/9
1.5/y-(3/9) = 0
1.5/y-1/3 = 0
1.5*y^-1 = 1/3 // : 1.5
y^-1 = 0.22222222
-1 < 0
1/(y^1) = 0.22222222 // * y^1
1 = 0.22222222*y^1 // : 0.22222222
4.50000005 = y^1
y = 4.50000005
y = 4.50000005
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