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