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4x = 12
x = 3
2. 8 - 2x = 4
4 = 2x
x = 2
3. 9 - 6x = 3
6x = 6
x = 1
4. 21 - 2z = 15
6 = 2z
z = 3
4x = 2 + 10
x = 12 ÷ 4
x = 3
2. 8 - 2x = 4
- 2x = 4 - 8
x = - 4 ÷ -2
x = 2
3. 9 - 6x = 3
- 6x = 3 - 9
x = - 6 ÷ - 6
x = 1
4. 21 - 2z = 15
- 2z = 15 - 21
z = - 6 ÷ - 2
z = 3
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