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