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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y = 1/64-1 // - 1/64-1
1/y-(1/64)+1 = 0
1/y-1/64+1 = 0
1*y^-1 = -63/64 // : 1
y^-1 = -63/64
-1 < 0
1/(y^1) = -63/64 // * y^1
1 = -63/64*y^1 // : -63/64
-64/63 = y^1
y = -64/63
y = -64/63
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