1. 3x + x - 2x + 8 = 3x + x 2. 2 (2x + 4) - 2x = x + 18
3. If x = 5 , evaluate : 2 ( x + 3) + 3x
4. 3 (2x) - 3x + 4= 2x + 5
5. 3x +2x + x = x + 6
6. 2 ( x+ 4) + x = 16

Step-by-step explanation:

1. 3x+x-2x+8=3x+x

x-2x+8=x

x+8=x+2x

8=2x

8÷2=4

x=4

2. 2(2x+4)-2x=x+18

8+4x-2x=x+18

8+2x=x+18

2x=x+10

x=10

3. 2(x+3)+3x

2(5+3)+15

16+15

31

4. 3(2x)-3x+4=2x+5

6x-3x+4=2x+5

3x+4=2x+5

3x-2x+4=5

x=1

5. 3x+2x+x=x+6

6x=x+6

5x=6

x=6/5

6. 2(x+4)+x=16

2x+8+x=16

3x+8=16

3x=8

x=8/3

Hope I calculated it right you can check it in calculator

step-by-step explanation: