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D( y )
y-7 = 0
y-7 = 0
y-7 = 0
y-7 = 0 // + 7
y = 7
y in (-oo:7) U (7:+oo)
(y-6)/(y-7) = 0
y-6 = 0 // + 6
y = 6
y = 6
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