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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
13/y = 10/11 // - 10/11
13/y-(10/11) = 0
13/y-10/11 = 0
13*y^-1 = 10/11 // : 13
y^-1 = 10/143
-1 < 0
1/(y^1) = 10/143 // * y^1
1 = 10/143*y^1 // : 10/143
143/10 = y^1
y = 143/10
y = 143/10
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