What is the law of the sign change of mathematics without bracket in the first volume of junior high school

What is the law of the sign change of mathematics without bracket in the first volume of junior high school

For example: a + (B + C-D) = a + B + c-d. if the sign before the bracket is - sign, then after removing the bracket, the sign of the number in the original bracket should be changed accordingly, + becomes -, - becomes +. For example: a - (B + C-D) = a - B - C + D. to remove the bracket, just go one by one in order. For example: a - {B - [C + D - (E + F)]}

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