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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
10/y = -5/13 // + -5/13
10/y-(-5/13) = 0
10/y+5/13 = 0
10*y^-1 = -5/13 // : 10
y^-1 = -1/26
-1 < 0
1/(y^1) = -1/26 // * y^1
1 = -1/26*y^1 // : -1/26
-26 = y^1
y = -26
y = -26
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