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X in (-oo:+oo)
(3/1)*(8*X-(9/7)) = 0
3*(8*X-9/7) = 0
( 3 )
3 = 0
X belongs to the empty set
( 8*X-9/7 )
8*X-9/7 = 0 // + 9/7
8*X = 9/7 // : 8
X = 9/7/8
X = 9/56
X = 9/56
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