How much does each bag of onions cost?

Amira buys cookies and onions at the store.
She pays a total of $51.40.
She pays a total of $6.18 for the cookies.
She buys 7 bags of onions that each cost the same amount.
How much does each bag of onions cost?

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x = price of a bag of onions that each cost the same amount

7x + 6.18 = 51.40  {7 bags of onions + cookies equals total of 51.40}
7x = 45.22  {subtracted 6.18 from each side}
x = 6.46  {divided each side by 7}

A bag of onions costs $6.46.

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