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(2/9)*((9/4)*x-9) = 0
2/9*(9/4*x-9) = 0
( 2/9 )
2/9 = 0
x belongs to the empty set
( 9/4*x-9 )
9/4*x-9 = 0 // + 9
9/4*x = 9 // : 9/4
x = 9/9/4
x = 4
x = 4
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