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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(2*y)/y-y-(7/6)-6 = 0
(2*y)/y-y-7/6-6 = 0
-y-31/6 = 0 // + 31/6
-y = 31/6 // * -1
y = -31/6
y = -31/6
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