How do i deal with this table

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Feb 21, 2006
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I have a table which i would like to get some calculations from a querry
What is the best solution

I have a balance transactionAmount TransactionType and newAmount
Balance TransactionAmount TransactionType newAmount
200 50 1 ?
i want to calculate the new amount in the querry. the issue is if the transaction type is "1" i want to add the balance to the transactionAmoun.
If the transactionType is 2 i will like the perform a subtraction: balance -transactionAmount

How do i achieve this
 
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