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n in (-oo:+oo)
(2/7)*(14*n-28) = 0
2/7*(14*n-28) = 0
( 14*n-28 )
14*n-28 = 0 // + 28
14*n = 28 // : 14
n = 28/14
n = 2
( 2/7 )
2/7 = 0
n belongs to the empty set
n = 2
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