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n in (-oo:+oo)
n*((7*n-6)/7) = 0
(n*(7*n-6))/7 = 0
( 7*n-6 )
7*n-6 = 0 // + 6
7*n = 6 // : 7
n = 6/7
( n )
n = 0
n in { 6/7, 0 }
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