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The seventh grade math topic is about absolute value.
First, two thirds is greater than zero, so its absolute value is equal to two thirds, and zero is less than two thirds. So the absolute value of 0 is less than two thirds-the absolute value of 7 is equal to 7, and the absolute value of 7 is equal to 7, so the absolute value of -7 is equal to the absolute value of 7.

The absolute value of a number is greater than or equal to zero, so if the absolute value of -a is equal to -a, (-a) should be greater than or equal to zero, and a is less than or equal to zero when solving inequality.

The essence of absolute value is not well grasped.