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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8-7/y = -5 // + 5
5-7/y+8 = 0
-7*y^-1 = -13 // : -7
y^-1 = 13/7
-1 < 0
1/(y^1) = 13/7 // * y^1
1 = 13/7*y^1 // : 13/7
7/13 = y^1
y = 7/13
y = 7/13
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