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