Answer:
1 / 5
Explanation:
5 / 7 of x is 1 / 7
( 5 / 7 ) * x = 1 / 7
x = ( 1 / 7 ) * ( 7 / 5 )
= ( 1 * 7 ) / ( 7 * 5 )
x = 1 / 5
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