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D( y )
1.5*y = 0
1.5*y = 0
1.5*y = 0
1.5*y = 0 // : 1.5
y = 0
y in (-oo:0) U (0:+oo)
1/(1.5*y) = 0.25 // - 0.25
1/(1.5*y)-0.25 = 0
0.66666667*y^-1 = 0.25 // : 0.66666667
y^-1 = 0.375
-1 < 0
1/(y^1) = 0.375 // * y^1
1 = 0.375*y^1 // : 0.375
2.66666667 = y^1
y = 2.66666667
y = 2.66666667
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