It is dividing by 3
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Inverse means opposite so division is the opposite of multiplacation
cross-multiplying
Well, for a product, you would be multiplying. So 19 and it's opposite, -19, you would multiply them to get a product of -361.
There is no difference in the procedure.
Dividing by twelve is the same thing as multiplying by 1/12. Thus, multiplying a number by 12/1, or twelve, is the opposite (inverse) of dividing a number by twelve.