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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/10 = 20/y // - 20/y
2/10-(20/y) = 0
2/10-20*y^-1 = 0
-20*y^-1 = -1/5 // : -20
y^-1 = 1/100
-1 < 0
1/(y^1) = 1/100 // * y^1
1 = 1/100*y^1 // : 1/100
100 = y^1
y = 100
y = 100
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