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