In mathematics, the order of operations dictates that you perform addition and subtraction in the order they appear from left to right in an expression. This means that you should perform addition before subtraction only if addition comes before subtraction in the expression. If addition and subtraction are next to each other, you would perform them from left to right.
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According to the order of operations, addition and subtraction have the same precedence. That means that you add/subtract from left to right.
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The denominators must be the same before you can add or subtract fractions.
deposit = add withdraw = subtract