1. On your whiteboards:
Solve this equation
4a + 5 = 29
4a = 24
a = 6

2. On your whiteboards:
Solve this equation
3a - 4 = 20
3a = 24
a = 8

3. On your whiteboards:
Solve this equation
5a - 7 = 58
5a = 65
a = 13

4. In your books:
Let’s practice
3a + 2 = 17
6a + 2 = 20
17 = 3a + 2
23 = 7a + 2
3a + 2 = 14
8a + 2 = 26
20 = 3a + 2
Put a number in the box so that a = 4
5a = 21
5a = 26
6a = 20
5a = 25
7a = 23

5. 2(2x + 5) = 44 What if there were brackets?
In your pairs discuss what this equation means and how you would solve it.
2(2x + 5) = 44

6. 2(3x + 5) = 28 28
One student started their working out like this:
3x + 5 = 14
What had they done?

7. 2(3x + 5) = 28 28
A different student started their working out like this:
6x + 10 = 28
What had they done?

8. 2(4b + 4) = 40 3(b + 2) = 30 40 = 4(2b + 2) 30 = 3(2b + 2)
In your books:
Let’s practice
3(b + 2) = 30
2(4b + 4) = 40
30 = 3(2b + 2)
40 = 4(2b + 2)
3(4b + 2) = 30
8(b + 1) = 40
5(b - 4) = 15
Put a number in the box so that b = 10
18 = 6(b - 4)
3(b ) = 33
7(b - 4) = 21
(b - 4) = 48