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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
21/y-8 = 5 // - 5
21/y-8-5 = 0
21*y^-1 = 13 // : 21
y^-1 = 13/21
-1 < 0
1/(y^1) = 13/21 // * y^1
1 = 13/21*y^1 // : 13/21
21/13 = y^1
y = 21/13
y = 21/13
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