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