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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
14/y+8 = 0
14*y^-1 = -8 // : 14
y^-1 = -4/7
-1 < 0
1/(y^1) = -4/7 // * y^1
1 = -4/7*y^1 // : -4/7
-7/4 = y^1
y = -7/4
y = -7/4
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