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