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n in (-oo:+oo)
(4/3)*(7-n) = 0
4/3*(7-n) = 0
( 4/3 )
4/3 = 0
n belongs to the empty set
( 7-n )
7-n = 0 // - 7
-n = -7 // * -1
n = 7
n = 7
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