Printable math worksheet for solving addition and subtraction equations with variables.

Let’s solve each equation step by step. We’re solving for x in each case — that means we want to find what number x must be to make the equation true.

We’ll go one by one, using simple steps:
→ If you see “+”, subtract from both sides.
→ If you see “–”, add to both sides.
→ Always do the same thing to both sides of the equals sign!

---

1. x + 27 = 48
Subtract 27 from both sides:
x = 48 – 27 → x = 21

2. x + 10 = 17
Subtract 10 from both sides:
x = 17 – 10 → x = 7

3. x – 73 = 17
Add 73 to both sides:
x = 17 + 73 → x = 90

4. x – 73 = 144
Add 73 to both sides:
x = 144 + 73 → x = 217

5. 10 – x = 77
This is tricky! Let’s move x to the other side.
First, subtract 10 from both sides:
–x = 77 – 10 → –x = 67
Now multiply both sides by –1:
x = –67

*(Check: 10 – (–67) = 10 + 67 = 77 ✔)*

6. x + 1 = 9
Subtract 1 from both sides:
x = 9 – 1 → x = 8

7. 5 – x = 12
Subtract 5 from both sides:
–x = 12 – 5 → –x = 7
Multiply by –1:
x = –7

*(Check: 5 – (–7) = 5 + 7 = 12 ✔)*

8. 2 = x + 12
Same as x + 12 = 2
Subtract 12 from both sides:
x = 2 – 12 → x = –10

9. x – 8 = 19
Add 8 to both sides:
x = 19 + 8 → x = 27

10. x – 22 = 30
Add 22 to both sides:
x = 30 + 22 → x = 52

11. 13 = x + 4
Same as x + 4 = 13
Subtract 4 from both sides:
x = 13 – 4 → x = 9

12. x – 4 = 5
Add 4 to both sides:
x = 5 + 4 → x = 9

13. x – 17 = 22
Add 17 to both sides:
x = 22 + 17 → x = 39

14. x + 13 = 27
Subtract 13 from both sides:
x = 27 – 13 → x = 14

15. 24 = x + 15
Same as x + 15 = 24
Subtract 15 from both sides:
x = 24 – 15 → x = 9

16. x – 7 = 14
Add 7 to both sides:
x = 14 + 7 → x = 21

17. x + 22 = 20
Subtract 22 from both sides:
x = 20 – 22 → x = –2

18. 15 = x + 10
Same as x + 10 = 15
Subtract 10 from both sides:
x = 15 – 10 → x = 5

---

Final Answer:
1. x = 21
2. x = 7
3. x = 90
4. x = 217
5. x = –67
6. x = 8
7. x = –7
8. x = –10
9. x = 27
10. x = 52
11. x = 9
12. x = 9
13. x = 39
14. x = 14
15. x = 9
16. x = 21
17. x = –2
18. x = 5