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x in (-oo:+oo)
(1/3)*(6*x-9) = 0
1/3*(6*x-9) = 0
( 1/3 )
1/3 = 0
x belongs to the empty set
( 6*x-9 )
6*x-9 = 0 // + 9
6*x = 9 // : 6
x = 9/6
x = 3/2
x = 3/2
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