The subtraction rule of rational number is: subtracting a number is equal to what is the opposite of this number

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It's equal to the opposite of this number

Addition and subtraction of rational numbers. Addition and subtraction of rational numbers in junior high school: 3 / 4-2 / 7 + (- 1 / 6) - (- 2 / 3) - 1

3/4-2/7+（-1/6）-（-2/3）-1
=3/4-2/7-1/6+2/3-1
=3/4-2/7-1/6+4/6-1
=3/4-2/7+1/2-1
=(3/4+1/2-1)-2/7
=1/4-2/7
=7/28-8/28
=-1/28

(- 6 / 5) - 7 - (- 3.2) + (- 1), mixed operation of rational number addition and subtraction

(- 6 / 5) - 7 - (- 3.2) + (- 1)
=-1.2-7+3.2-1
=-6

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