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(2/5)*(2*x-8) = 0
2/5*(2*x-8) = 0
( 2*x-8 )
2*x-8 = 0 // + 8
2*x = 8 // : 2
x = 8/2
x = 4
( 2/5 )
2/5 = 0
x belongs to the empty set
x = 4
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