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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
25/y = 7/14 // - 7/14
25/y-(7/14) = 0
25/y-1/2 = 0
25*y^-1 = 1/2 // : 25
y^-1 = 1/50
-1 < 0
1/(y^1) = 1/50 // * y^1
1 = 1/50*y^1 // : 1/50
50 = y^1
y = 50
y = 50
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