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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-8 = (3*y+1)/y // - (3*y+1)/y
-((3*y+1)/y)-8 = 0
(-1*(3*y+1))/y-8 = 0
(-1*(3*y+1))/y+(-8*y)/y = 0
-1*(3*y+1)-8*y = 0
-11*y-1 = 0
(-11*y-1)/y = 0
(-11*y-1)/y = 0 // * y
-11*y-1 = 0
-11*y-1 = 0 // + 1
-11*y = 1 // : -11
y = 1/(-11)
y = -1/11
y = -1/11
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