2

x-2∈{1;-1;7;-7}
hay x∈{3;1;6;-5}

a: =>5x+25-3x+6=25+18

=>2x+41=43

=>2x=2

=>x=1

b: =>4x+8=3x+3+17

=>4x+8=3x+20

=>x=12

theo đề bài ta có:
       3n-3:n-2
=>3(n-2):n-2
=>3n-6-3n-3:n-2
=>-3:n-2
=>n-5

số phần tử là:
(2022-3):3+1=674
                   đ/s:....

=(15/34+19/34)+1/3-4/3
=1-1
=0

1. My mom is a teacher. She teaches English at my school.

2. My grandparents live in the house near the sea.

3. How many teachers are there in your school?

4. What do you do every morning?

ta có: 2n-3:n+1
=> n+1:n+1
=>2(n+1):n+1
=>2n-3-2n+3:n+1
=>0:n+1
=>n= -1