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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
16/y = 10/21 // - 10/21
16/y-(10/21) = 0
16/y-10/21 = 0
16*y^-1 = 10/21 // : 16
y^-1 = 5/168
-1 < 0
1/(y^1) = 5/168 // * y^1
1 = 5/168*y^1 // : 5/168
168/5 = y^1
y = 168/5
y = 168/5
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