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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(15/2)*(13/y)-10 = 89 // - 89
(15/2)*(13/y)-89-10 = 0
195/2*y^-1 = 99 // : 195/2
y^-1 = 66/65
-1 < 0
1/(y^1) = 66/65 // * y^1
1 = 66/65*y^1 // : 66/65
65/66 = y^1
y = 65/66
y = 65/66
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