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Solve equations with a variable
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Learn it A variable (like n) stands for an unknown number. Undo the operations in reverse order to find it.
Example: Solve $3n + 7 = 31$.
- Undo + 7: $3n = 31 - 7 = 24$.
- Undo × 3: $n = 24 \div 3 = 8$.
- Check: $3 \times 8 + 7 = 31$ ✓.
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