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