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(1/3)*(7*x-3) = 0
1/3*(7*x-3) = 0
( 1/3 )
1/3 = 0
x belongs to the empty set
( 7*x-3 )
7*x-3 = 0 // + 3
7*x = 3 // : 7
x = 3/7
x = 3/7
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