x-18=29 x+15=52 64-а=52 17+b=28. x-23=57. 48-x=20

Here are the solutions (each equation is independent):

• x − 18 = 29 → x = 29 + 18 = 47
• x + 15 = 52 → x = 52 − 15 = 37
• 64 − a = 52 → a = 64 − 52 = 12
• 17 + b = 28 → b = 28 − 17 = 11
• x − 23 = 57 → x = 57 + 23 = 80
• 48 − x = 20 → x = 48 − 20 = 28

If you want, I can show more detailed steps or verify each one.