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8*((1/2)*x-2) = 0
8*(1/2*x-2) = 0
( 1/2*x-2 )
1/2*x-2 = 0 // + 2
1/2*x = 2 // : 1/2
x = 2/1/2
x = 4
( 8 )
8 = 0
x belongs to the empty set
x = 4
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