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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/7 = 5/y // - 5/y
2/7-(5/y) = 0
2/7-5*y^-1 = 0
-5*y^-1 = -2/7 // : -5
y^-1 = 2/35
-1 < 0
1/(y^1) = 2/35 // * y^1
1 = 2/35*y^1 // : 2/35
35/2 = y^1
y = 35/2
y = 35/2
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