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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2*((5*y)/y)-(2*y) = 0
2*((5*y)/y)-2*y = 0
10-2*y = 0 // - 10
-2*y = -10 // : -2
y = -10/(-2)
y = 5
y = 5
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