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x in (-oo:+oo)
(7/9)*(x-(3/7)) = 0
(7/9)*(x-3/7) = 0
7/9*(x-3/7) = 0
( 7/9 )
7/9 = 0
x belongs to the empty set
( x-3/7 )
x-3/7 = 0 // + 3/7
x = 3/7
x = 3/7
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