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(2/3)*(12*x-9) = 0
2/3*(12*x-9) = 0
( 12*x-9 )
12*x-9 = 0 // + 9
12*x = 9 // : 12
x = 9/12
x = 3/4
( 2/3 )
2/3 = 0
x belongs to the empty set
x = 3/4
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