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What is the concept of mathematics in the first volume of the seventh grade?
The mathematical concepts in the first volume of Grade 7 are as follows:

Chapter 1: Rational Numbers.

Chapter 2: Addition and subtraction of algebraic expressions.

Chapter 3: One-dimensional linear equation.

Chapter four: the preliminary understanding of graphics.

Chapter 5: Intersection and bisection.

Chapter 6: Plane Cartesian Coordinate System.

Chapter 7: Triangle.

Chapter 8: Binary linear equations.

Chapter 9: Inequality and Unequal Groups.

Chapter 10: Data collection, arrangement and description.