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D( y )
y = 0
y^2 = 0
y = 0
y = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
y+1/y-(y/(y^2))-36+6 = y-(3/y)-6 // - y-(3/y)-6
y-y+1/y-(y/(y^2))+3/y-36+6+6 = 0
y-y+1/y-y^-1+3/y-36+6+6 = 0
3*y^-1 = 24 // : 3
y^-1 = 8
-1 < 0
1/(y^1) = 8 // * y^1
1 = 8*y^1 // : 8
1/8 = y^1
y = 1/8
y = 1/8
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