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(1/2)*(2*x-7) = 0
1/2*(2*x-7) = 0
( 1/2 )
1/2 = 0
x belongs to the empty set
( 2*x-7 )
2*x-7 = 0 // + 7
2*x = 7 // : 2
x = 7/2
x = 7/2
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