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