Just like in a proof, we start out with what's given. For us, that would be 2*x* – 7 = 13. The next step would be adding 7 to both sides (gracias, addition property) and then dividing by 2 (merci, division property). Will that give us the right answer? You betcha. And here's the proof. **Statements** | **Reasons** | 1. 2*x* – 7 = 13 | Given | 2. 2*x* = 20 | Add 7 to both sides of (1) | 3. *x* = 10 | Divide both sides of (2) by 2 |
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