The definition of page 18 in the first volume of the seventh grade.

The distance between the point representing the number A on the number axis and the origin is called the absolute value of the number A. According to the definition on page 1 18 of the seventh grade mathematics textbook, the distance between the point representing the number A on the number axis and the origin is called the absolute value of the number A. The number axis: the straight line defining the origin, positive direction and unit length is called the number axis.

Equations with unknowns are called equations.

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