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x in (-oo:+oo)
x*((9*(7*x-9))/10) = 0
(9*x*(7*x-9))/10 = 0
( 7*x-9 )
7*x-9 = 0 // + 9
7*x = 9 // : 7
x = 9/7
( 9 )
9 = 0
x belongs to the empty set
( x )
x = 0
x in { 9/7, 0 }
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