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D( y )
6*y-12 = 0
6*y-12 = 0
6*y-12 = 0
6*y-12 = 0 // + 12
6*y = 12 // : 6
y = 12/6
y = 2
y in (-oo:2) U (2:+oo)
(7*y-35)/(6*y-12) = 0
7*y-35 = 0 // + 35
7*y = 35 // : 7
y = 35/7
y = 5
y = 5
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