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(2+4)5-7 (6)5-7 30-7 23
There is no operation for a single number and so there can be no order of operation.
23 is not equal to 912. 2/3 is not equal to 9/12.
A mathematical expression has numbers and operation signs with no equal sign. Equations, on the other hand, do contain equal signs.
23 in fraction = 23/1