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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/y+1/3 = 5/y+1/5 // - 5/y+1/5
3/y-(5/y)+1/3-(1/5) = 0
3/y-5*y^-1+1/3-1/5 = 0
-2*y^-1 = -2/15 // : -2
y^-1 = 1/15
-1 < 0
1/(y^1) = 1/15 // * y^1
1 = 1/15*y^1 // : 1/15
15 = y^1
y = 15
y = 15
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