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A mathematical expression has numbers and operation signs with no equal sign. Equations, on the other hand, do contain equal signs.
3020 is a number, not an operation. A number cannot have an inverse operation.
An "expression", is part of a number sentence that combines numbers and operation signs but does not have an equal sign" Example: x/y , when x=10 and y=5 , the assumption of this expresssion is 10/5 or 2. Or: 2+3 , the assumption of this expression is 5 even though no equal sign is present. Lyle Larson 4th grade Southern California
There is no operation for a single number and so there can be no order of operation.
if you know the operation of your number you can do inverse operation