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How to calculate negative and positive, and how to calculate negative burden reduction?
Calculation method of negative negative positive:

It depends on the size of the minuend and the absolute value of the minuend. If the minuend is greater than the minuend, the difference is still negative, on the contrary, the difference is positive.

It is equal to adding the reciprocal of this positive number, such as-a-b = adding a and b, and then adding a negative sign to the result.

For example: -5-8 =- 13

Calculation method of negative burden reduction:

A negative number is a positive number. Add up these two numbers. For example, -A-(-B)=A and B are subtracted, A uses "-"and B uses "+".

Example: -4-(-2)= -2