Write an equation for:
- the difference between \(x\) and \(3\) is \(4\). (1 mark)
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- the product of \(m\) and \(7\) is \(21\). (1 mark)
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- the sum of \(p\) and \(3\) is doubled and the answer is 8. (1 mark)
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- half of \(z\) is added to 6 and the result is 12. (1 mark)
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