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The study aims to explain the different effects between multiplication, addition, division and subtraction equations. In this sense, multiplication and addition equations develop a new element or fact, while division equations express information within the element or fact, subtraction is the selection of the element or fact. Furthermore, for a multiplication and addition equation to result in the new element or fact, it is necessary to depend on the intensity of a specific physical concept, without extreme change, as this would result in the alteration of the element or fact. It is worth highlighting the importance of fixed values ​​in the equation to describe the specific nature of the element or fact. The study makes it possible to understand open equations (without solutions) in mathematics and physics, in addition to understanding existing equations. The study helps in understanding the theory of obligatory necessity, the theory of differences between elements, the theory of limited numbers and the theory of greater and lesser progressions.