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(1/2)*(12*x-4) = 0
1/2*(12*x-4) = 0
( 1/2 )
1/2 = 0
x belongs to the empty set
( 12*x-4 )
12*x-4 = 0 // + 4
12*x = 4 // : 12
x = 4/12
x = 1/3
x = 1/3
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