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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y-7 = 3/y-5 // - 3/y-5
5/y-(3/y)-7+5 = 0
5/y-3*y^-1-7+5 = 0
2*y^-1 = 2 // : 2
y^-1 = 1
-1 < 0
1/(y^1) = 1 // * y^1
1 = 1*y^1 // : 1
1 = y^1
y = 1
y = 1
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