if 7 articles can be bought for $
find the cost of 5 articles
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7 = 5 1/7
1= 5 1/7*7
1=36/7*7
1=36
5=36*5
5= 180
1= 5 1/7*7
1=36/7*7
1=36
5=36*5
5= 180
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