It's called inverse operation.
Example: 3x + 4 - 4 The 4s undo each other and you are just left with 3x
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Brackets Exponents Division Multiplication Addition Subtraction
It could be either. How much doesn't refer to the process, it refers to the answer.
Order of operations, namely: Parentheses Exponents Multiplication Division Addition Subtraction
i am not sure what it means but I think it stands for Brackets Intervals Addition and Subtraction but you will have to check
It is an operation with blocks,flats,longs and units that can be answered by addition,subtraction,multiplication and division.