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D( y )
50-(2*y) = 0
50-(2*y) = 0
50-(2*y) = 0
50-2*y = 0
50-2*y = 0 // - 50
-2*y = -50 // : -2
y = -50/(-2)
y = 25
y in (-oo:25) U (25:+oo)
1/(50-(2*y)) = 0
1/(50-2*y) = 0
1 = 0
y belongs to the empty set
y belongs to the empty set
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