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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
67.5-(y/y) = 0.35 // - 0.35
67.5-(y/y)-0.35 = 0
67.5-1-0.35 = 0
66.15 = 0
y belongs to the empty set
y belongs to the empty set
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