Answer:
Look Below
Step-by-step explanation:
I'm not going to do any of these, i'll just set up the equation for you to find x.
9. 75+x=90
10. x+22=180
11. x=84
12. 82+78+x=180
13. (4x+3)+(x-8)=90
14. (8x+9)+(5x+15)=180 (This was hard to read, check to see if I typed it right.)
15. 2x+4+140=180
16. 4x-13=67+2x
17. 9x+7=115
18. 12x=60
19. 4x=x+21
20. 5x+12+73=180
